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VU CS601 – DATA COMMUNICATION FINALTERM solved unsolved past papers

VU CS601 – DATA COMMUNICATION FINALTERM Solved Unsolved Past Papers

BPS (Bits Per Second) :  The rate of information  bits transmit ted. The basic unit of data communications rate, very often
combined with metric prefixes, such as kbps for thousands of bits per second and mbps for millions of bits per second.

 

 

 

Bridge :                 The  interconnecting  equipment  and  techniques  used  to  match  circuits  to  each  other  ensuring  minimum

transmission impairment. Bridges function at the data link layer of the OSI model. Contrast with gateway.

 

Buffer :                                   A temporary storage device for blocks of data used to compensate for the difference in either the rate of data flow

devices.

 

Byte :                     Some set of contiguous bits operated upon as a single unit, usually six or eight bits long. Most character sets use

one byte per character, with storage device capacity usually spoken of in K bytes (K = 1024 bytes) and M bytes (M = mega, or million bytes).

 

Cable :                  The combined assembly of one or more conductors within a protective sheath and constructed to permit the use of

conductors separately or in groups

 

Cable-Based         A local area network (LAN) that uses a coaxial or twisted pair cable as its transmission medium.

LAN :

 

Coaxial Cable       A two-conductor wire transmission medium known for its wide bandwidth and negligible susceptibility to

(Coax) :                 crosstalk and distortion, since signals are transmitted in a fully enclosed environment.

 

 

 

 

 

 

 

Code :                   A system of unambiguous rules and symbols for use in representing data, such as ASCII and EBCDIC

 

CODEC :              device that codes and de codes analog voice signals into and from digital signals. A neologism of “COder” and

“DECoder”.

 

Digital Switching  A process whereby a connection is established and maintained through program control. Digital information is

:                             routed between input and output.

 

Digital                   The direct transmission of discrete pulses as opposed to analog transmission.

Transmission :

 

Discrete Access : An access method found in LAN environments using a star topology, wherein each station has its own separate

connection to maximize the LAN’s switching capabilities.

 

Duplex                  The simultaneous, independent,  2-way transmission of data in both directions. Contrast with “half- duplex

Transmission :      transmission”.

 

Error :                  A term used to describe a deviation from the expected, especially if data integrity is jeopardized.

 

Error Rate :         The measure of data integrity given as the blocks, bits or characters incorrectly received, versus the number

transmit ted. Error rate is sometimes seen as a rate of one error every one million bits.

 

Ethernet :             The  de  facto  standard  LAN  of  the  Xerox  corporation  and  later  sponsored  also  by  DEC  and  Intel  Corp.

Characterized by 10 m bps baseband transmission using CSMA/CD, Ethernet uses coaxial cable and is similar to the standard LAN recommended by IEEE 802.3.

 

 

 

 

 

 

 

Ground Station : Also known as an earth station, a ground station is designed to send (transmit) and receive signals to and from a

communications satellite.

 

IC (Integrated      Also known as a microchip, and as a semiconductor device, an IC performs numerous functions in data processing

Circuit) :               such as processing, data storage and program storage.

 

IEEE :                   (Institute of Electrical and Electronic Engineers) – An international institute that issues its own standards and is a

member of ANSI and ISO, perhaps best known for its development of IEEE Project 802.

 

Impulse Noise :   A  communications  line  interference  caused  by  electrical  action,  lightning,  on/off  movement  of  switching

equipment, etc., and appearing as high amplitude and short duration.

 

Infrared :              A method of data transmission using infrared light to transmit data on fiber optic medium or open-air transmission

over short distances.

 

Interface :             Two related definitions exist in common computer usage: 1) A common boundary or connection defined by

identical signal and physical inter connection characteristics and their meanings. 2) The necessary equipment

needed to provide a shared boundary connection.

 

Internetwork        A Local Area Network (LAN) device used for communications between sub networks, transmit ting only the

Router :                messages for the correct sub network. Inter network routers function within the network layer of the OSI model.

 

Interrupt :            A device generated signal notifying the CPU that it needs its assistance. Such a signal may arise from either

software or hardware and is usually task oriented.

 

ISO :                      (International Standards Organization) – The International, voluntary standards organization, closely aligned with

 

 

 

 

 

 

 

the CCITT perhaps best noted for its OSI model and OSI communications protocol. Membership includes other international organizations issuing standards, with ANSI being the American representative.

 

kbps :                    (Kilo Bits Per Second) – Thousands of bits per second (BPS) equal to 10 to the third power.

 

Keying :                A method of encoding data by modulating the carrier either by phase or frequency.

 

kHz (kilo Hertz)   Abbreviation for 1000 Hertz (cycles per second).

:

 

LAN (Local          The data communications facilities used to provide communications within a limited geographical area, normally

Area Network) :   up to 6 miles, using medium to high data rates between 9600 bps to 100 mbps. LAN ‘s may have bridges or

gateways to other networks but are usually confined to a building or cluster or buildings, frequently referred to as

a “campus”.

 

Latency :               The waiting time, or delay between a stations request to a transmission channel, and completion.

 

Layer :                  A term used to define one level of a hierarchy of functions, as specified by the OSI reference model. Divisions of

other protocols, such as IBM ‘s SNA, sometimes will correspond to one or more OSI layers.

 

Line :                     A multipoint or point-to-point communications medium .

 

MAC (Media        An access control protocol defined under IEEE 802 which includes variations for the token ring, token bus and

Access Control) :  CSMA/CD.

 

 

 

 

 

 

 

Mainframe :         A large-scale computer, capable of processing large amounts of data with very fast processing, including control

units and peripheral devices supplied by one vendor, examples of which would include IBM, Unisys, Control

Data, and others. Often, mainframe systems will have a closed architecture.

 

Manchester           A binary signaling mechanism in which each bit period is divided into two complementary halves, combining data

Code,                     and clock pulses.

Manchester

Encoding :

 

Mbps :                   Millions of bits per second ( bps).

 

Medium :              The material used to record or transmit data.

 

Message :              Two definitions exist in normal usage: 1) A communication containing some information. 2) Several packets that

comprise a complete transmission

 

Message Routing  Selecting a path or channel for message transmission.

:

 

MHz                      A unit equal to one million cycles per second (Hz).

(MegaHertz) :

 

Microsecond :    One millionth of a second

 

Microwave,           Transmitting voice or data via any electromagnetic wave in the radio-frequency spectrum above 890 mHz, in a

Microwave            line-of-sight fashion, with repeaters every 20-30 miles.

 

 

 

VU CS601 – DATA COMMUNICATION FINALTERM Solved Unsolved Past Papers

VU CS601 – DATA COMMUNICATION FINALTERM solved unsolved past papers

VU CS601 – DATA COMMUNICATION FINALTERM Solved Unsolved Past Papers

 

 

 

Correct Option :        2            From :  Lecture 16

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Question # 40

One factor in the accuracy of a reconstructed PCM signal is the _______.

1) :       Number of bits used for quantization

2) :       Signal bandwidth

3) :       Carrier frequency

4) :       Baud rate

Correct Option :        1            From :  Lecture 16

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Question # 41

In PCM, an analog-to- _______ conversion occurs.

1) :       Analog

2) :       Digital

3) :       QAM

4) :       Differential

Correct Option :        2            From :  Lecture 16

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 42

If the maximum value of a PCM signal is 31 and the minimum value is -31, how many bits were used for coding?

1) :       4

2) :       5

3) :       6

4) :       7

Correct Option :        3            From :  Lecture 16

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Question # 43

Which quantization level results in a more faithful reproduction of the signal?

1) :       2

2) :       8

3) :       16

4) :       32

Correct Option :        4            From :  Lecture 16

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Question # 44

In _______ transmission, bits are transmitted over a single wire, one at a time.

1) :       Asynchronous serial

2) :       Synchronous serial

3) :       Parallel

4) :       (a) and (b)

Correct Option :        4            From :  Lecture 17

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 45

 

 

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In _______ transmission, a start bit and a stop bit frame a character byte.

1) :       Synchronous serial

2) :       Asynchronous serial

3) :       Parallel

4) :       (a) and (b)

Correct Option :        2            From :  Lecture 17

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Question # 46

If a symbol is composed of 3 bits, there are _______ data levels.

1) :       2

2) :       4

3) :       8

4) :       16

Correct Option :        3            From :  Lecture 17

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Question # 47

The Nyquist theorem specifies the minimum sampling rate to be_______.

1) :       Twice the bandwidth of a signal

2) :       Twice the highest frequency of a signal

3) :       Equal to the lowest frequency of a signal

4) :       Equal to the highest frequency of a signal

Correct Option :        2            From :  Lecture 17

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Question # 48

Pulse rate is always _______ the bit rate.

1) :       Less than

2) :       Less than or equal to

3) :       Greater than

4) :       Greater than or equal to

Correct Option :        2            From :  Lecture 17

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Question # 49

ASK, PSK, FSK, and QAM are examples of ________ conversion.

1) :       digital-to-digital

2) :       digital-to-analog

3) :       analog-to-analog

4) :       analog-to-digital

Correct Option :        2            From :  Lecture 17

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Question # 50

In QAM, both ________ of a carrier frequency are varied.

1) :       frequency and amplitude

2) :       phase and frequency

3) :       amplitude and phase

4) :       none of the above

Correct Option :        3            From :  Lecture 17

 

 

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MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 51

If the baud rate is 400 for a QPSK signal, the bit rate is ________ bps.

1) :       100

2) :       400

3) :       800

4) :       1600

Correct Option :        3            From :  Lecture 17

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Question # 52

If the bit rate for an ASK signal is 1200 bps, the baud rate is ________.

1) :       300

2) :       400

3) :       600

4) :       1200

Correct Option :        4            From :  Lecture 17

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Question # 53

If the bit rate for an FSK signal is 1200 bps, the baud rate is ________.

1) :       300

2) :       400

3) :       600

4) :       1200

Correct Option :        4            From :  Lecture 17

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Question # 54

If the bit rate for a 16-QAM signal is 4000 bps, what is the baud rate?

1) :       300

2) :       400

3) :       1000

4) :       1200

Correct Option :        4            From :  Lecture 17

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Question # 55

If the baud rate for a 64-QAM signal is 2000, what is the bit rate?

1) :       300

2) :       400

3) :       1000

4) :       12000

Correct Option :        3            From :  Lecture 17

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Question # 56

Quadrature amplitude modulation (QAM) is a combination of ___________.

1) :       ASK and FSK

2) :       ASK and PSK

3) :       PSK and FSK

 

 

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4) :       none of the above

Correct Option :        2            From :  Lecture 17

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Question # 57

________ uses two carriers, one in-phase and the other quadrature.

1) :       ASK

2) :       PSK

3) :       FSK

4) :       QAM

Correct Option :        4            From :  Lecture 17

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Question # 58

Analog-to-analog conversion is needed if the available bandwidth is _______.

1) :       low-pass

2) :       band-pass

3) :       either (a) or (b)

4) :       neither (a) nor (b)

Correct Option :        2            From :  Lecture 17

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Question # 59

Which of the following is not an analog-to-analog conversion?

1) :       AM

2) :       PM

3) :       FM

4) :       QAM

Correct Option :        4            From :  Lecture 17

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 60

In _____ transmission, the carrier signal is modulated so that its amplitude varies with the changing amplitudes of the modulating signal.

1) :       AM

2) :       PM

3) :       FM

4) :       none of the above

Correct Option :        1            From :  Lecture 17

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 61

In _____ transmission, the frequency of the carrier signal is modulated to follow the changing voltage level (amplitude) of the modulating signal. The peak amplitude and phase of the carrier signal remain constant, but as the amplitude of the information signal changes, the frequency of the carrier changes correspondingly.

1) :       AM

2) :       PM

3) :       FM

4) :       none of the above

Correct Option :        3            From :  Lecture 17

 

 

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MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 62

In _____ transmission, the phase of the carrier signal is modulated to follow the changing voltage level (amplitude) of the modulating signal.

1) :       AM

2) :       PM

3) :       FM

4) :       none of the above

Correct Option :        2            From :  Lecture 17

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 63

In _______, the peak amplitude of one signal level is 0; the other is the same as the amplitude of the carrier frequency.

1) :       PSK

2) :       OOK

3) :       FSK

4) :       none of the above

Correct Option :        2            From :  Lecture 17

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Question # 64

The constellation diagram of 16-QAM has ______ dots.

1) :       4

2) :       16

3) :       8

4) :       none of the above

Correct Option :        3            From :  Lecture 17

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 65

The Federal Communications Commission (FCC) allows ______kHz for each AM station.

1) :       5

2) :       10

3) :       20

4) :       none of the above

Correct Option :        2            From :  Lecture 17

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 66

The Federal Communications Commission (FCC) allows ______ kHz for each FM station.

1) :       20

2) :       100

3) :       200

4) :       none of the above

Correct Option :        2            From :  Lecture 17

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 67

 

 

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Which of the following is not a digital-to-analog conversion?

1) :       ASK

2) :       PSK

3) :       FSK

4) :       AM

Correct Option :        4            From :  Lecture 18

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 68

In ________, the amplitude of the carrier signal is varied to create signal elements. Both frequency and phase remain constant.

1) :       ASK

2) :       PSK

3) :       FSK

4) :       QAM

Correct Option :        1            From :  Lecture 18

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 69

In _________, the frequency of the carrier signal is varied to represent data. Both peak amplitude and phase remain constant.

1) :       ASK

2) :       PSK

3) :       FSK

4) :       QAM

Correct Option :        3            From :  Lecture 18

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 70

In ________, the phase of the carrier is varied to represent two or more different signal elements. Both peak amplitude and frequency remain constant.

1) :       ASK

2) :       PSK

3) :       FSK

4) :       QAM

Correct Option :        2            From :  Lecture 18

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 71

A constellation diagram shows us the __________ of a signal element,
particularly when we are using two carriers (one in-phase and one quadrature).

1) :       amplitude and phase

2) :       amplitude and frequency

3) :       frequency and phase

4) :       none of the above

Correct Option :        1            From :  Lecture 18

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Question # 72

_________ conversion is the representation of analog information by an analog

signal.

 

 

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1) :       Digital-to-analog

2) :       Analog-to-analog

3) :       Analog-to-digital

4) :       Digital-to-digital

Correct Option :        2            From :  Lecture 18

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Question # 73

AM and FM are examples of ________ conversion.

1) :       digital-to-digital

2) :       digital-to-analog

3) :       analog-to-analog

4) :       analog-to-digital

Correct Option :        3            From :  Lecture 19

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 74

Given an AM radio signal with a bandwidth of 10 KHz and the highest-frequency component at 705 KHz, what is the frequency of the carrier signal?

1) :       700 KHz

2) :       705 KHz

3) :       710 KHz

4) :       Cannot be determined from given information

Correct Option :        1            From :  Lecture 19

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 75

If the available channel is a ____ channel, we cannot send a digital signal directly to the channel.

1) :       low-pass

2) :       bandpass

3) :       low rate

4) :       high rate

Correct Option :        2            From :  Lecture 20

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 76

For a ______ channel, the Nyquist bit rate formula defines the theoretical maximum bit rate.

1) :       noisy

2) :       noiseless

3) :       bandpass

4) :       low-pass

Correct Option :        2            From :  Lecture 20

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 77

For a ______ channel, we need to use the Shannon capacity to find the maximum bit rate.

1) :       noisy

2) :       noiseless

 

 

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3) :       bandpass

4) :       low-pass

Correct Option :        1            From :  Lecture 20

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Question # 1

Data communication is the exchange of information one entity to other using a Transmission_________.

1) :       Protocol

2) :       Medium

3) :       Signal

4) :       All the above

Correct Option :        2            From :  Lecture 1

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Question # 2

The _______ is the physical path over which a message travels.

1) :       Protocol

2) :       Medium

3) :       Signal

4) :       All the above

Correct Option :        2            From :  Lecture 1

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 3

The information to be communicated in a data communications system is the _______.

1) :       Medium

2) :       Protocol

 

 

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3) :       Message

4) :       Transmission

Correct Option :        3            From :  Lecture 1

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Question # 4

Medium twisted wire have speed to transform the information ___________

1) :       300bps-10Mbps

2) :       256Kbps-100Mbps

3) :       56Kbps-200Mbps

4) :       500Kbps-10Gbps

Correct Option :        1            From :  Lecture 1

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Question # 5

Medium Microwave have speed to transform the information ___________

1) :       300bps-10Mbps

2) :       256Kbps-100Mbps

3) :       56Kbps-200Mbps

4) :       500Kbps-10Gbps

Correct Option :        2            From :  Lecture 1

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Question # 6

Medium Coaxial Cable have speed to transform the information ___________

1) :       300bps-10Mbps

2) :       256Kbps-100Mbps

3) :       56Kbps-200Mbps

4) :       500Kbps-10Gbps

Correct Option :        3            From :  Lecture 1

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Question # 7

Medium Fiber Optic Cable have speed to transform the information ___________

1) :       300bps-10Mbps

2) :       256Kbps-100Mbps

3) :       56Kbps-200Mbps

4) :       500Kbps-10Gbps

Correct Option :        4            From :  Lecture 1

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 8

A set of rules that govern on the flow of Data/information in a communication System is called______________

1) :       Protocol

2) :       Medium

3) :       Signal

4) :       Ring

Correct Option :        1            From :  Lecture 1

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 9

 

 

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_______is a Communication dialog between network users or applications.

1) :       Session

2) :       Node

3) :       Protocol

4) :       Medium

Correct Option :        1            From :  Lecture 1

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 10

Two or more devices connecting to each other to exchange the information is called __________________

1) :       Session

2) :       Node

3) :       Network

4) :       Medium

Correct Option :        3            From :  Lecture 1

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Question # 11

In a network each attached device is called _______

1) :       Session

2) :       Node

3) :       Network

4) :       Medium

Correct Option :        2            From :  Lecture 1

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Question # 12

Mail services are available to network users through the _______ layer.

1) :       Data link

2) :       Physical

3) :       Application

4) :       Transport

Correct Option :        3            From :  Lecture 10

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Question # 13

Which of the following is an application layer service?

1) :       Remote log-in

2) :       File transfer and access

3) :       Mail service

4) :       All the above

Correct Option :        4            From :  Lecture 10

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Question # 14

Before data can be transmitted, they must be transformed to ________.

1) :       periodic signals

2) :       electromagnetic signals

3) :       aperiodic signals

4) :       low-frequency sine waves

 

 

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Correct Option :        2            From :  Lecture 11

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Question # 15

A periodic signal completes one cycle in 0.001 s. What is the frequency?

1) :       1 Hz

2) :       100 Hz

3) :       1 KHz

4) :       1 MHz

Correct Option :        3            From :  Lecture 11

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 16

Given two sine waves A and B, if the frequency of A is twice that of B, then the period of B is ________ that of A.

1) :       one-half

2) :       twice

3) :       the same as

4) :       indeterminate from

Correct Option :        2            From :  Lecture 11

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Question # 17

A sine wave is ________.

1) :       periodic and continuous

2) :       aperiodic and continuous

3) :       periodic and discrete

4) :       aperiodic and discrete

Correct Option :        1            From :  Lecture 11

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 18

If the maximum amplitude of a sine wave is 2 V, the minimum amplitude is ________ V.

1) :       2

2) :       1

3) :       -2

4) :       between -2 and 2

Correct Option :        3            From :  Lecture 11

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Question # 19

Data can be ________.

1) :       analog

2) :       digital

3) :       analog or digital

4) :       none of the above

Correct Option :        3            From :  Lecture 11

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 20

_______ data are continuous and take continuous values.

 

 

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1) :       analog

2) :       digital

3) :       analog or digital

4) :       none of the above

Correct Option :        1            From :  Lecture 11

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Question # 21

_______ data have discrete states and take discrete values.

1) :       analog

2) :       digital

3) :       analog or digital

4) :       none of the above

Correct Option :        2            From :  Lecture 11

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Question # 22

Signals can be ________.

1) :       analog

2) :       digital

3) :       either analog or digital

4) :       neither analog or digital

Correct Option :        3            From :  Lecture 11

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Question # 23

_____ signals can have an infinite number of values in a range.

1) :       analog

2) :       digital

3) :       analog or digital

4) :       none of the above

Correct Option :        1            From :  Lecture 11

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Question # 24

_______ signals can have only a limited number of values.

1) :       analog

2) :       digital

3) :       analog or digital

4) :       none of the above

Correct Option :        2            From :  Lecture 11

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Question # 25

Frequency and period are ______.

1) :       inverse of each other

2) :       proportional to each other

3) :       the same

4) :       none of the above

Correct Option :        1            From :  Lecture 11

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Question # 26

________is the rate of change with respect to time.

1) :       Amplitude

2) :       Time

3) :       Frequency

4) :       Voltage

Correct Option :        3            From :  Lecture 11

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Question # 27

_______ describes the position of the waveform relative to time 0.

1) :       Frequency

2) :       Phase

3) :       Amplitude

4) :       Voltage

Correct Option :        2            From :  Lecture 11

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Question # 28

In a frequency-domain plot, the horizontal axis measures the ________.

1) :       peak amplitude

2) :       frequency

3) :       phase

4) :       slope

Correct Option :        2            From :  Lecture 12

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Question # 29

In a time-domain plot, the horizontal axis is a measure of ________.

1) :       signal amplitude

2) :       frequency

3) :       phase

4) :       time

Correct Option :        4            From :  Lecture 12

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 30

A sine wave in the ______ domain can be represented by one single spike in the _____ domain.

1) :       time; frequency

2) :       frequency; time

3) :       time; phase

4) :       phase; time

Correct Option :        1            From :  Lecture 12

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 31

A _________ sine wave is not useful in data communications; we need to send a _______ signal.

1) :       composite; single-frequency

2) :       single-frequency; composite

 

 

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3) :       single-frequency; double-frequency

4) :       none of the above

Correct Option :        2            From :  Lecture 12

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 32

The _____ of a composite signal is the difference between the highest and the lowest frequencies contained in that signal.

1) :       frequency

2) :       period

3) :       bandwidth

4) :       amplitude

Correct Option :        3            From :  Lecture 12

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Question # 33

A(n)_________ signal is a composite analog signal with an infinite bandwidth.

1) :       digital

2) :       analog

3) :       either analog or digital

4) :       neither analog or digital

Correct Option :        1            From :  Lecture 12

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 34

Baseband transmission of a digital signal is possible only if we have a ____ channel.

1) :       low-pass

2) :       bandpass

3) :       low rate

4) :       high rate

Correct Option :        1            From :  Lecture 12

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Question # 35

The _________ product defines the number of bits that can fill the link.

1) :       bandwidth-period

2) :       frequency-amplitude

3) :       bandwidth-delay

4) :       delay-amplitude

Correct Option :        2            From :  Lecture 12

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 36

If the bandwidth of a signal is 5 KHz and the lowest frequency is 52 KHz, what is the highest frequency?

1) :       5 KHz

2) :       10 KHz

3) :       10 KHz

4) :       57 KHz

Correct Option :        4            From :  Lecture 13

 

 

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MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 37

What is the bandwidth of a signal that ranges from 1 MHz to 4 MHz?

1) :       4 MHz

2) :       1 KHz

3) :       3 MHz

4) :       none of the above

Correct Option :        3            From :  Lecture 13

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Question # 38

As frequency increases, the period ________.

1) :       decreases

2) :       increases

3) :       remains the same

4) :       doubles

Correct Option :        1            From :  Lecture 13

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 39

A signal is measured at two different points. The power is P1 at the first point and P2 at the second point. The dB is 0. This means ________.

1) :       P2 is zero

2) :       P2 equals P1

3) :       P2 is much larger than P1

4) :       P2 is much smaller than P1

Correct Option :        2            From :  Lecture 13

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 40

If the frequency spectrum of a signal has a bandwidth of 500 Hz with the highest frequency at 600 Hz, what should be the sampling rate, according to the Nyquist
theorem?

1) :       500 samples/s

2) :       1000 samples/s

3) :       200 samples/s

4) :       1200 samples/s

Correct Option :        4            From :  Lecture 13

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Question # 41

Block coding can help in _______ at the receiver.

1) :       Synchronization

2) :       Error detection

3) :       Attenuation

4) :       (a) and (b)

Correct Option :        4            From :  Lecture 14

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 42

In _______ transmission, bits are transmitted simultaneously, each across its own

 

 

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wire.

1) :       Parallel

2) :       Asynchronous serial

3) :       Synchronous serial

4) :       (a) and (b)

Correct Option :        1            From :  Lecture 14

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Question # 43

Unipolar, bipolar, and polar encoding are types of _______ encoding.

1) :       Block

2) :       Line

3) :       NRZ

4) :       Manchester

Correct Option :        2            From :  Lecture 14

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Question # 44

_______ encoding has a transition at the middle of each bit.

1) :       RZ

2) :       Manchester

3) :       Differential Manchester

4) :       All the above

Correct Option :        4            From :  Lecture 14

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Question # 45

Which encoding type always has a nonzero average amplitude?

1) :       Polar

2) :       Bipolar

3) :       Unipolar

4) :       All the above

Correct Option :        3            From :  Lecture 14

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 46

_______ conversion is the process of changing one of the characteristics of an analog signal based on the information in the digital data.

1) :       Digital-to-analog

2) :       Analog-to-analog

3) :       Analog-to-digital

4) :       Digital-to-digital

Correct Option :        1            From :  Lecture 14

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 47

Which encoding technique attempts to solve the loss of synchronization due to long strings of 0s?

1) :       NRZ

2) :       B8ZS

3) :       AMI

 

 

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4) :       (a) and (b)

Correct Option :        2            From :  Lecture 15

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Question # 48

_______ encoding has a transition at the beginning of each 0 bit.

1) :       Differential Manchester

2) :       RZ

3) :       Manchester

4) :       All the above

Correct Option :        1            From :  Lecture 15

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Question # 49

Which of the following encoding methods does not provide for synchronization?

1) :       Manchester

2) :       NRZ-L

3) :       RZ

4) :       NRZ-I

Correct Option :        2            From :  Lecture 15

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Question # 50

Which encoding method uses alternating positive and negative values for 1s?

1) :       Manchester

2) :       AMI

3) :       NRZ-I

4) :       RZ

Correct Option :        2            From :  Lecture 15

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Question # 51

RZ encoding involves _______ signal levels.

1) :       Five

2) :       Four

3) :       Three

4) :       Two

Correct Option :        3            From :  Lecture 15

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Question # 52

PCM is an example of _______ conversion.

1) :       Analog-to-analog

2) :       Analog-to-digital

3) :       Digital-to-digital

4) :       Digital-to-analog

Correct Option :        2            From :  Lecture 16

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Question # 53

One factor in the accuracy of a reconstructed PCM signal is the _______.

1) :       Number of bits used for quantization

 

 

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2) :       Signal bandwidth

3) :       Carrier frequency

4) :       Baud rate

Correct Option :        1            From :  Lecture 16

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Question # 54

In PCM, an analog-to- _______ conversion occurs.

1) :       Analog

2) :       Digital

3) :       QAM

4) :       Differential

Correct Option :        2            From :  Lecture 16

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 55

If the maximum value of a PCM signal is 31 and the minimum value is -31, how many bits were used for coding?

1) :       4

2) :       5

3) :       6

4) :       7

Correct Option :        3            From :  Lecture 16

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Question # 56

Which quantization level results in a more faithful reproduction of the signal?

1) :       2

2) :       8

3) :       16

4) :       32

Correct Option :        4            From :  Lecture 16

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Question # 57

In _______ transmission, bits are transmitted over a single wire, one at a time.

1) :       Asynchronous serial

2) :       Synchronous serial

3) :       Parallel

4) :       (a) and (b)

Correct Option :        4            From :  Lecture 17

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Question # 58

In _______ transmission, a start bit and a stop bit frame a character byte.

1) :       Synchronous serial

2) :       Asynchronous serial

3) :       Parallel

4) :       (a) and (b)

Correct Option :        2            From :  Lecture 17

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Question # 59

If a symbol is composed of 3 bits, there are _______ data levels.

1) :       2

2) :       4

3) :       8

4) :       16

Correct Option :        3            From :  Lecture 17

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Question # 60

The Nyquist theorem specifies the minimum sampling rate to be_______.

1) :       Twice the bandwidth of a signal

2) :       Twice the highest frequency of a signal

3) :       Equal to the lowest frequency of a signal

4) :       Equal to the highest frequency of a signal

Correct Option :        2            From :  Lecture 17

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Question # 61

Pulse rate is always _______ the bit rate.

1) :       Less than

2) :       Less than or equal to

3) :       Greater than

4) :       Greater than or equal to

Correct Option :        2            From :  Lecture 17

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Question # 62

ASK, PSK, FSK, and QAM are examples of ________ conversion.

1) :       digital-to-digital

2) :       digital-to-analog

3) :       analog-to-analog

4) :       analog-to-digital

Correct Option :        2            From :  Lecture 17

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Question # 63

In QAM, both ________ of a carrier frequency are varied.

1) :       frequency and amplitude

2) :       phase and frequency

3) :       amplitude and phase

4) :       none of the above

Correct Option :        3            From :  Lecture 17

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Question # 64

If the baud rate is 400 for a QPSK signal, the bit rate is ________ bps.

1) :       100

2) :       400

3) :       800

4) :       1600

 

 

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Correct Option :        3            From :  Lecture 17

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Question # 65

If the bit rate for an ASK signal is 1200 bps, the baud rate is ________.

1) :       300

2) :       400

3) :       600

4) :       1200

Correct Option :        4            From :  Lecture 17

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Question # 66

If the bit rate for an FSK signal is 1200 bps, the baud rate is ________.

1) :       300

2) :       400

3) :       600

4) :       1200

Correct Option :        4            From :  Lecture 17

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Question # 67

If the bit rate for a 16-QAM signal is 4000 bps, what is the baud rate?

1) :       300

2) :       400

3) :       1000

4) :       1200

Correct Option :        4            From :  Lecture 17

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Question # 68

If the baud rate for a 64-QAM signal is 2000, what is the bit rate?

1) :       300

2) :       400

3) :       1000

4) :       12000

Correct Option :        3            From :  Lecture 17

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Question # 69

Quadrature amplitude modulation (QAM) is a combination of ___________.

1) :       ASK and FSK

2) :       ASK and PSK

3) :       PSK and FSK

4) :       none of the above

Correct Option :        2            From :  Lecture 17

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Question # 70

________ uses two carriers, one in-phase and the other quadrature.

1) :       ASK

2) :       PSK

 

 

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3) :       FSK

4) :       QAM

Correct Option :        4            From :  Lecture 17

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Question # 71

Analog-to-analog conversion is needed if the available bandwidth is _______.

1) :       low-pass

2) :       band-pass

3) :       either (a) or (b)

4) :       neither (a) nor (b)

Correct Option :        2            From :  Lecture 17

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Question # 72

Which of the following is not an analog-to-analog conversion?

1) :       AM

2) :       PM

3) :       FM

4) :       QAM

Correct Option :        4            From :  Lecture 17

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 73

In _____ transmission, the carrier signal is modulated so that its amplitude varies with the changing amplitudes of the modulating signal.

1) :       AM

2) :       PM

3) :       FM

4) :       none of the above

Correct Option :        1            From :  Lecture 17

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 74

In _____ transmission, the frequency of the carrier signal is modulated to follow the changing voltage level (amplitude) of the modulating signal. The peak amplitude and phase of the carrier signal remain constant, but as the amplitude of the information signal changes, the frequency of the carrier changes correspondingly.

1) :       AM

2) :       PM

3) :       FM

4) :       none of the above

Correct Option :        3            From :  Lecture 17

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 75

In _____ transmission, the phase of the carrier signal is modulated to follow the changing voltage level (amplitude) of the modulating signal.

1) :       AM

2) :       PM

3) :       FM

 

 

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4) :       none of the above

Correct Option :        2            From :  Lecture 17

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 76

In _______, the peak amplitude of one signal level is 0; the other is the same as the amplitude of the carrier frequency.

1) :       PSK

2) :       OOK

3) :       FSK

4) :       none of the above

Correct Option :        2            From :  Lecture 17

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Question # 77

The constellation diagram of 16-QAM has ______ dots.

1) :       4

2) :       16

3) :       8

4) :       none of the above

Correct Option :        3            From :  Lecture 17

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 78

The Federal Communications Commission (FCC) allows ______kHz for each AM station.

1) :       5

2) :       10

3) :       20

4) :       none of the above

Correct Option :        2            From :  Lecture 17

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 79

The Federal Communications Commission (FCC) allows ______ kHz for each FM station.

1) :       20

2) :       100

3) :       200

4) :       none of the above

Correct Option :        2            From :  Lecture 17

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Question # 80

Which of the following is not a digital-to-analog conversion?

1) :       ASK

2) :       PSK

3) :       FSK

4) :       AM

Correct Option :        4            From :  Lecture 18

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Question # 81

In ________, the amplitude of the carrier signal is varied to create signal elements. Both frequency and phase remain constant.

1) :       ASK

2) :       PSK

3) :       FSK

4) :       QAM

Correct Option :        1            From :  Lecture 18

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 82

In _________, the frequency of the carrier signal is varied to represent data. Both peak amplitude and phase remain constant.

1) :       ASK

2) :       PSK

3) :       FSK

4) :       QAM

Correct Option :        3            From :  Lecture 18

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 83

In ________, the phase of the carrier is varied to represent two or more different signal elements. Both peak amplitude and frequency remain constant.

1) :       ASK

2) :       PSK

3) :       FSK

4) :       QAM

Correct Option :        2            From :  Lecture 18

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 84

A constellation diagram shows us the __________ of a signal element,
particularly when we are using two carriers (one in-phase and one quadrature).

1) :       amplitude and phase

2) :       amplitude and frequency

3) :       frequency and phase

4) :       none of the above

Correct Option :        1            From :  Lecture 18

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Question # 85

_________ conversion is the representation of analog information by an analog

signal.

1) :       Digital-to-analog

2) :       Analog-to-analog

3) :       Analog-to-digital

4) :       Digital-to-digital

Correct Option :        2            From :  Lecture 18

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 86

 

 

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AM and FM are examples of ________ conversion.

1) :       digital-to-digital

2) :       digital-to-analog

3) :       analog-to-analog

4) :       analog-to-digital

Correct Option :        3            From :  Lecture 19

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 87

Given an AM radio signal with a bandwidth of 10 KHz and the highest-frequency component at 705 KHz, what is the frequency of the carrier signal?

1) :       700 KHz

2) :       705 KHz

3) :       710 KHz

4) :       Cannot be determined from given information

Correct Option :        1            From :  Lecture 19

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 88

The physical communication pathway that transfers data from one device to another is called ______________

1) :       Link

2) :       Path

3) :       Circuit

4) :       Routing

Correct Option :        1            From :  Lecture 2

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Question # 89

End to End rout Within a Network is called ________

1) :       Link

2) :       Path

3) :       Circuit

4) :       Routing

Correct Option :        2            From :  Lecture 2

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Question # 90

In the original ARPANET, _______ were directly connected together.

1) :       IMPs

2) :       host computers

3) :       networks

4) :       routers

Correct Option :        1            From :  Lecture 2

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Question # 91

This was the first network.

1) :       CSNET

2) :       ANSNET

3) :       ARPANET

 

 

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4) :       NSFNET

Correct Option :        3            From :  Lecture 2

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Question # 92

Well Designed Softwae can speed up the Process

1) :       TRUE

2) :       FALSE

3) :

4) :

Correct Option :        1            From :  Lecture 2

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Question # 93

There are 5 Factors on which performance depend. Chose one set

1) :       Number of Users, medium type, Hardware, software and Network criteria

2) :       Number of Users,Nodes, Hardware, software and Network criteria

3) :       Number of Users,Nodes, Hardware, software and Network

4) :       None of the Given

Correct Option :        1            From :  Lecture 2

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 94

Frequency of failure and network recovery time after a failure is measures of the _______ of a network.

1) :       Performance

2) :       Reliability

3) :       Security

4) :       Feasibility

Correct Option :        2            From :  Lecture 2

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Question # 95

An unauthorized user is a network _______ issue.

1) :       Performance

2) :       Reliability

3) :       Security

4) :       All the above

Correct Option :        3            From :  Lecture 2

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Question # 96

Example of the Network application for Teleconferencing is _______

1) :       Conferenc

2) :       Video

3) :       Video Conferencing

4) :       None of the Given

Correct Option :        3            From :  Lecture 2

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 97

The complete path between two terminals over which can communicate is called

 

 

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1) :       Link

2) :       path

3) :       Circuit

4) :       routing

Correct Option :        3            From :  Lecture 2

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 98

Node can be a computer, printer or any other device capable of sending or receiving.

1) :       TRUE

2) :       FALSE

3) :

4) :

Correct Option :        1            From :  Lecture 2

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Question # 99

One Advantages of the Distributed processing is _______

1) :       Collaborative Processing

2) :       Multitasking

3) :       Network

4) :       Fast and Costly

Correct Option :        1            From :  Lecture 2

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 100

If the available channel is a ____ channel, we cannot send a digital signal directly to the channel.

1) :       low-pass

2) :       bandpass

3) :       low rate

4) :       high rate

Correct Option :        2            From :  Lecture 20

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 101

For a ______ channel, the Nyquist bit rate formula defines the theoretical maximum bit rate.

1) :       noisy

2) :       noiseless

3) :       bandpass

4) :       low-pass

Correct Option :        2            From :  Lecture 20

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 102

For a ______ channel, we need to use the Shannon capacity to find the maximum bit rate.

1) :       noisy

 

 

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2) :       noiseless

3) :       bandpass

4) :       low-pass

Correct Option :        1            From :  Lecture 20

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Question # 103

The boundary between two pieces if equipment is called _________

1) :       Interface

2) :       Signal Genreation

3) :       Network

4) :       None of the Given

Correct Option :        1            From :  Lecture 3

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Question # 104

Which one are the communication tasks ______________

1) :       Signal and sending data

2) :       Addressing, Communicate, sending Data

3) :       Interface, routing and Security

4) :       There are not Tasks for Communications

Correct Option :        3            From :  Lecture 3

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Question # 105

What , How to and when to communicated is defined bye

1) :       Protocol

2) :       Medium

3) :       Signal

4) :       Transmission

Correct Option :        1            From :  Lecture 3

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Question # 106

Key elements of the Protocol are _________________

1) :       Signals, Semantic and Tuning

2) :       Syntax, Semantic and Tuning

3) :       Protocol, Interface and Tuning

4) :       Tuning, Interface and Routing

Correct Option :        2            From :  Lecture 3

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 107

The Structure of format of data, meaning the order in which key are presented is known as ___________

1) :       Semantic

2) :       Tuning

3) :       Signals

4) :       Syntax

Correct Option :        4            From :  Lecture 3

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Question # 108

________ Refer to the meaning of each section bits.

1) :       Semantic

2) :       Tuning

3) :       Signals

4) :       Syntax

Correct Option :        1            From :  Lecture 3

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Question # 109

When data should be sent and how fast it be sent is decided by________

1) :       Semantic

2) :       Tuning

3) :       Signals

4) :       Syntax

Correct Option :        2            From :  Lecture 3

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 110

_______ refers to two characteristics: when data should be sent and how fast it can be sent.

1) :       Semantics

2) :       Syntax

3) :       Timing

4) :       None of the above

Correct Option :        3            From :  Lecture 3

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Question # 111

There are two Main type of Standards________

1) :       De facto and De Law

2) :       De facto and De jure

3) :       Proprietary and De Facto

4) :       No Proprietary and Proprietary

Correct Option :        2            From :  Lecture 4

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Question # 112

No Proprietary and Proprietary are subtype of ______

1) :       Open

2) :       De Law

3) :       De Jure

4) :       De Facto

Correct Option :        4            From :  Lecture 4

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Question # 113

Standards are developed mainly bye __________ entities:

1) :       6

2) :       4

3) :       3

 

 

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4) :       2

Correct Option :        3            From :  Lecture 4

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 114

There are ________ and they are slow moving and cannot co-op with the fast growing communication industry.

1) :       Procedural Bodies

2) :       Many Propels

3) :       Some Engineers

4) :       Many Engineers

Correct Option :        1            From :  Lecture 4

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Question # 115

International standard Organization includes representatives from _____ countries

1) :       82

2) :       150

3) :       83

4) :       68

Correct Option :        1            From :  Lecture 4

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 116

V series, X Series and ISDN (integrated Services Digital Network) are Defined bay ______

1) :       ISO

2) :       ITU-T

3) :       CCITT

4) :       ANSI

Correct Option :        2            From :  Lecture 4

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Question # 117

___ submits Proposal to ITU-T

1) :       USA

2) :       ISO

3) :       IEEE

4) :       ANSI

Correct Option :        4            From :  Lecture 4

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Question # 118

______ Is the World largest society of professional engineers.

1) :       USA

2) :       ISO

3) :       IEEE

4) :       ANSI

Correct Option :        3            From :  Lecture 4

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 119

 

 

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IEEE is stand for ______________________________

1) :       International Electrical and Electronics Engineers

2) :       International Electrically and Electronics Engineers

3) :       International Educated Electrically Engineers

4) :       None of the Given

Correct Option :        1            From :  Lecture 4

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Question # 120

_____refer to the way two or more devices attach to a link

1) :       Protocol

2) :       Medium

3) :       Line Configuration

4) :       Transmission

Correct Option :        3            From :  Lecture 4

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Question # 121

A _______ connection provides a dedicated link between two devices.

1) :       point-to-point

2) :       multipoint

3) :       primary

4) :       secondary

Correct Option :        1            From :  Lecture 4

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Question # 122

In a _______ connection, more than two devices can share a single link.

1) :       point-to-point

2) :       multipoint

3) :       primary

4) :       secondary

Correct Option :        2            From :  Lecture 4

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Question # 123

In a ______ connection, two and only two devices are connected by a dedicated

link.

1) :       multipoint

2) :       point-to-point

3) :       ( and (

4) :       None of the above

Correct Option :        2            From :  Lecture 4

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Question # 124

In a ________ connection, three or more devices share a link.

1) :       multipoint

2) :       point-to-point

3) :       ( and (

4) :       None of the above

 

 

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Correct Option :        1            From :  Lecture 4

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Question # 125

If several devices can share the link simultaneously, its called spatially shared

1) :       Spatial Shared

2) :       Temporal Shared

3) :       point-to-point

4) :       multipoint

Correct Option :        1            From :  Lecture 4

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Question # 126

If user must take turns using the link, then it’s called ___________________

1) :       Spatial Shared

2) :       Temporal Shared

3) :       point-to-point

4) :       multipoint

Correct Option :        2            From :  Lecture 4

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Question # 127

Which topology requires a central controller or hub?

1) :       Mesh

2) :       Star

3) :       Bus

4) :       Ring

Correct Option :        2            From :  Lecture 5

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Question # 128

Which topology requires a multipoint connection?

1) :       Mesh

2) :       Star

3) :       Bus

4) :       Ring

Correct Option :        3            From :  Lecture 5

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Question # 129

___________defines the physical or the logical outlook of the network.

1) :       Typology

2) :       Star

3) :       Bus

4) :       Ring

Correct Option :        1            From :  Lecture 5

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Question # 130

______ refers to the physical or logical arrangement of a network.

1) :       Data flow

 

 

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2) :       Mode of operation

3) :       Topology

4) :       None of the above

Correct Option :        3            From :  Lecture 5

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Question # 131

Devices may be arranged in a _____ topology.

1) :       Mesh

2) :       Ring

3) :       Bus

4) :       All of the above

Correct Option :        4            From :  Lecture 5

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 132

Communication between a computer and a keyboard involves ______________ transmission.

1) :       simplex

2) :       half-duplex

3) :       full-duplex

4) :       automatic

Correct Option :        1            From :  Lecture 6

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Question # 133

A television broadcast is an example of _______ transmission.

1) :       simplex

2) :       half-duplex

3) :       full-duplex

4) :       automatic

Correct Option :        1            From :  Lecture 6

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 134

In _______ transmission, the channel capacity is shared by both communicating devices at all times.

1) :       simplex

2) :       half-duplex

3) :       full-duplex

4) :       half-simplex

Correct Option :        3            From :  Lecture 6

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Question # 135

Data flow between two devices can occur in a _______ way.

1) :       simplex

2) :       half-duplex

3) :       full-duplex

4) :       all of the above

Correct Option :        4            From :  Lecture 6

 

 

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MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 136

A _______ is a data communication system within a building, plant, or campus, or between nearby buildings.

1) :       MAN

2) :       LAN

3) :       WAN

4) :       None of the above

Correct Option :        2            From :  Lecture 6

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Question # 137

A ______ is a data communication system spanning states, countries, or the whole

world.

1) :       MAN

2) :       LAN

3) :       WAN

4) :       None of the above

Correct Option :        3            From :  Lecture 6

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Question # 138

________ is a collection of many separate networks.

1) :       A WAN

2) :       An internet

3) :       A LAN

4) :       None of the above

Correct Option :        1            From :  Lecture 6

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Question # 139

There are ______________ Internet service providers.

1) :       Local

2) :       Regional

3) :       National and international

4) :       All of the above

Correct Option :        3            From :  Lecture 6

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Question # 140

A ________ is a set of rules that governs data communication.

1) :       Forum

2) :       Protocol

3) :       Standard

4) :       None of the above

Correct Option :        2            From :  Lecture 6

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Question # 141

________ is an idea or concept that is a precursor to an Internet standard.

1) :       RCF

 

 

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2) :       RFC

3) :       ID

4) :       None of the above

Correct Option :        2            From :  Lecture 6

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Question # 142

The _______ layer changes bits into electromagnetic signals.

1) :       Physical

2) :       Transport

3) :       None of the above

4) :       Data link

Correct Option :        1            From :  Lecture 7

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 143

The physical layer is concerned with the transmission of _______ over the physical medium.

1) :       Programs

2) :       Protocols

3) :       Bits

4) :       Dialogs

Correct Option :        3            From :  Lecture 7

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 144

Which layer functions as a liaison between user support layers and network support layers?

1) :       Network layer

2) :       Transport layer

3) :       Physical layer

4) :       Application layer

Correct Option :        3            From :  Lecture 7

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Question # 145

The Internet model consists of _______ layers.

1) :       Three

2) :       Five

3) :       Seven

4) :       Eight

Correct Option :        2            From :  Lecture 7

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Question # 146

The _______ layer is the layer closest to the transmission medium.

1) :       Network

2) :       Physical

3) :       Data link

4) :       Transport

Correct Option :        2            From :  Lecture 7

 

 

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MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 147

The _______ layer lies between the network layer and the application layer.

1) :       Data link

2) :       Physical

3) :       Transport

4) :       None of the above

Correct Option :        3            From :  Lecture 8

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Question # 148

Layer 2 lies between the physical layer and the _______ layer.

1) :       Data link

2) :       Network

3) :       Transport

4) :       None of the above

Correct Option :        2            From :  Lecture 8

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 149

As the data packet moves from the lower to the upper layers, headers are _______.

1) :       Added

2) :       Rearranged

3) :       Modified

4) :       Subtracted

Correct Option :        4            From :  Lecture 9

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 150

As the data packet moves from the upper to the lower layers, headers are _______.

1) :       Removed

2) :       Added

3) :       Rearranged

4) :       Modified

Correct Option :        3            From :  Lecture 9

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 151

When data are transmitted from device A to device B, the header from A’s layer 4 is read by B’s _______ layer.

1) :       Physical

2) :       Application

3) :       Transport

4) :       None of the above

Correct Option :        3            From :  Lecture 9

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 152

What is the main function of the transport layer?

 

 

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1) :       Process-to-process delivery

2) :       Node-to-node delivery

3) :       Synchronization

4) :       Updating and maintenance of routing tables

Correct Option :        1            From :  Lecture 9

MCQS Printed From Vulhr.com, Come Visit and Upgrade You Knowledge Question # 153

The process-to-process delivery of the entire message is the responsibility of the _______ layer.

1) :       Physical

2) :       Network

3) :       Transport

4) :       Application

Correct Option :        3            From :  Lecture 9

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Question No: 1      ( Marks: 1 ) – Please choose one

Dividing data into manageable parts or data chunks is called as
► packetizing

► framing

► both are true
► both are false

 

 

Question No: 2      ( Marks: 1 ) – Please choose one

 

 

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_________requires the maximum number of I/O ports.
► Bus

► Star
► Mesh
► Ring

 

 

Question No: 3      ( Marks: 1 ) – Please choose one

Unidirectional traffic movement is overcome by dual ring technology.
► True

► False

 

 

Question No: 4      ( Marks: 1 ) – Please choose one

Headers are added at layers 1 and 7 of OSI model.
► True

► False

 

 

Question No: 5      ( Marks: 1 ) – Please choose one

Upper OSI layers are always implemented in _________
► software

► hardware

 

► both hardware and software

 

 

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Question No: 6      ( Marks: 1 ) – Please choose one

 

 

Internet with small “i” specifies the world wide Network the actual internet.

► True
► False

 

 

Question No: 7      ( Marks: 1 ) – Please choose one

Data synchronization is a function related with ___________
► session layer

► presentation layer
► transport

 

 

Question No: 8      ( Marks: 1 ) – Please choose one

Session layer is responsible for segmentation and reassembly.
► True

► False

 

 

Question No: 9      ( Marks: 1 ) – Please choose one

A periodic signal can always be decomposed into _____________
► exactly an odd number of sine waves

► a set of sine waves

 

 

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►  set of sine waves, one of the which must have a phase of 00 ► none of the given

 

 

Question No: 10      ( Marks: 1 ) – Please choose one

The powerful carrier signal is called as the___________
► carrier frequency

► base signal

► carrier frequency and base signal
► none of given

 

 

Question No: 11      ( Marks: 1 ) – Please choose one

In ____________ transmission the timing of the signal is unimportant.
► Asynchronous

► Synchronous
► Polar

► Bi-polar

 

 

 

Question No: 12      ( Marks: 1 ) – Please choose one

 

In case of uploading at the switching station, data is converted to digital signal using ___________.

► TCP

 

► PCM

 

 

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► ICP

► TDM

 

 

 

Question No: 13      ( Marks: 1 ) – Please choose one

Transmission of data from ISP to the subscriber is called Downloading.
► True

► False

 

 

Question No: 14      ( Marks: 1 ) – Please choose one

Transmission media are usually categorized as _____________
► Fixed or Unfixed

► Guided or Unguided

► Determinate or Indeterminate
► Metallic or Nonmetallic

 

 

Question No: 15      ( Marks: 1 ) – Please choose one

Category 1 UTP cable is most often used in __________ networks.
► Fast Ethernet

► Traditional Ethernet
► Infra-red

► Telephone

 

 

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Question No: 16      ( Marks: 1 ) – Please choose one

The inner core of an optical fiber is __________ in composition.
► Glass plastic

► Copper

► Bimetallic
► Liquid

 

 

Question No: 17      ( Marks: 1 ) – Please choose one

Radio wave and microwave frequencies range from _________.
► 3 to 300 KHz

► 300 KHz to300 KHz to 3 GHz
► 3 KHz to 300 GHz

► 3 KHz to 3000 GHz

 

 

Question No: 18      ( Marks: 1 ) – Please choose one

 

 

The _________ is an association that sponsors the use of infrared waves.

► IrDA
► EIA
► FCC
► PUD

 

 

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Question No: 19      ( Marks: 1 ) – Please choose one

 

 

Optical fibers are defined by the ratio of the ___________ of their core to the diameter of their cladding.

► Diameter

► Radius
► Length
► Width

 

 

Question No: 20      ( Marks: 1 ) – Please choose one

All of popular Fiber optic connectors are ___________ shaped.
► Conical

► Barrel
► Circular

► Rectangular

 

 

Question No: 21      ( Marks: 1 ) – Please choose one

Which media can support higher Bandwidths and higher data rates.
► Coaxial cable

► Optical fiber
► STP

► UTP

 

 

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Question No: 22      ( Marks: 1 ) – Please choose one

The VLF and LF bands use _________ propagation for communications.
► Ground

► Sky

► Line of sight
► Space

 

 

Question No: 23      ( Marks: 1 ) – Please choose one

 

Middle frequency waves having range 300 KHz-3 MHz always use __________ propagation.

 

► Ground

 

► Sky

► Line of Sight
► Space

 

 

Question No: 24      ( Marks: 1 ) – Please choose one

 

 

Which of the following are not used to measure the performance of TX Media.

 

► Throughput

► Propagation Speed
► Propagation Time

 

 

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► none of the given

 

 

Question No: 25      ( Marks: 1 ) – Please choose one

 

 

A portion of the path that carries TX b/w a given pair of devices is known as __________.

 

► Node

► Bridge
► Channel
► Gateway

 

 

Question No: 26      ( Marks: 1 ) – Please choose one

 

A prism can deflect the light depending upon the angle of ____________ and the frequency.

 

 

► Deviation

► Incident
► Refraction
► Reflection

 

 

Question No: 27      ( Marks: 1 ) – Please choose one

In bit ____________, MUX adds extra bits to a device.
► Stuffing

► Adding

 

 

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► Multiplication

► Exchanging

 

 

 

Question No: 28      ( Marks: 1 ) – Please choose one

 

Need for Addressing makes Asynchronous TDM inefficient for bit or byte ___________.

► Interleaving
► Addition
► Substraction

► None of the given

 

 

Question No: 29      ( Marks: 1 ) – Please choose one

 

 

_________ takes data from one high speed line and breaks it into portions.

► Multiplexing

► Inverse multiplexing
► Inverse subtraction
► Inverse addition

 

 

Question No: 30      ( Marks: 1 ) – Please choose one

 

 

Multiplexing has long been used as an essential tool in the ____________.

 

 

► Electronic industry

 

 

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► Telephone industry

► Space science
► VLAN

 

 

Question No: 31      ( Marks: 1 ) – Please choose one

 

The local loop has ___________ cable that connects the subscriber telephone to the nearest end office.

 

► Twisted-pair

 

► Coaxial

► Fiber-optic

 

► None of the given

 

 

Question No: 32      ( Marks: 1 ) – Please choose one

T Lines are ___________ lines designed for digital data.
► Analog

► Digital

► Composite
► Telephone

 

 

Question No: 33      ( Marks: 1 ) – Please choose one

 

In CRC there is no error if the remainder at the receiver is

 

 

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► Equal to the remainder at the sender

► Zero

 

► Nonzero

 

► The quotient at the sender

 

 

Question No: 34      ( Marks: 1 ) – Please choose one

Which error detection method involves the use of parity bits?
► Simple parity check & two dimensional parity check
► CRC

► Two-dimensional parity check
► Simple parity check

 

 

Question No: 35      ( Marks: 1 ) – Please choose one

 

If odd parity is used for ASCII error detection, the number of 0s per 8-bit symbol is _________

 

► Even

► Odd

► Indeterminate
► 42

 

 

Question No: 36      ( Marks: 1 ) – Please choose one

 

The Hamming code is a method of __________

 

 

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► Error detection

► Error correction
► Error ecapsulation

► Error detection & Error encapsulation

 

 

Question No: 37      ( Marks: 1 ) – Please choose one

Error control is both error _________ and error ___________
► detection; correction

► detection; deletion
► detection; avoidance
► detection; forwarding

 

 

Question No: 38      ( Marks: 1 ) – Please choose one

ENQ/ACK stands for______________
► Enquiry/ Acknowledgment
► Enque/ Acknowledgment
► Enquist/ Acknowledgment
► none of the given

 

 

Question No: 39      ( Marks: 1 ) – Please choose one

 

In primary-secondary communication ______________ is always the initiator of a session

 

 

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► Primary

► Secondary
► Sender

► Receiver

 

 

Question No: 40      ( Marks: 1 ) – Please choose one

 

Primary device uses ____________ to receive transmission from the secondary devices.

 

► ACK

► ENQ
► POLL

 

 

Question No: 41      ( Marks: 1 ) – Please choose one

 

 

In __________ ARQ, if a NAK is received, only the specific damaged or lost frame is retransmitted.

 

► Stop-and-wait

► Go-Back-N

 

► Selective repeat

 

► Stop-and-wait & Go-back-N

 

 

Question No: 42      ( Marks: 1 ) – Please choose one

A timer is set when ___________ is sent out.
► A data frame

 

 

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► An ACK

► A NAK

 

 

 

Question No: 43      ( Marks: 1 ) – Please choose one

 

For stop-and-wait ARQ, for N data packets sent, ___________ acknowledgments are needed.

 

► N

► 2N
► N-1
► N+1

 

 

Question No: 44      ( Marks: 1 ) – Please choose one

HDLC is an acronym for ______________.
► High-duplex line communication
► High-level data link control
► Half-duplex digital link combination
► Host double-level circuit

 

 

Question No: 45      ( Marks: 1 ) – Please choose one

 

The address field of a frame in HDLC protocol contains the address of the ________ station.

 

► Primary

 

 

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► Secondary

► Tertiary

 

► Primary and Secondary

 

 

Question No: 46      ( Marks: 1 ) – Please choose one

 

The DSAP and SSAP are addresses used by _________ to identify the protocol stacks.

 

► LLC

 

► MAC

► Network

 

 

Question No: 47      ( Marks: 1 ) – Please choose one

IEEE divides the base band category into   ______ standards.
► 5

► 4
► 3
► 6

 

 

Question No: 48      ( Marks: 1 ) – Please choose one

 

 

Which of the following is a bus topology LAN that uses base band signaling and has a max. segment length of 500 meters

 

► 10 Base5

 

 

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► 10 Base2

► 100 Base2
► 100 Base5

 

 

Question No: 49      ( Marks: 1 ) – Please choose one

 

 

We need ____________ to decompose a composite signal into its components.

► fourier transform
► nyquist theorem
► shannon capacity

 

 

Question No: 50      ( Marks: 1 ) – Please choose one

 

 

Data from computer is in ____________ form and the local loop handles _________ signals.

► Analog; analog
► Analog; digital
► Digital; digital
► Digital; analog

 

 

Question No: 51      ( Marks: 2 )

 

 

What is the relationship between the size of the CRC remainder and the

divisor?

 

 

Question No: 52      ( Marks: 2 )

 

 

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Stop-and- wait ARQ has two control variables S and R. What are their functions? [2]

 

 

Question No: 53      ( Marks: 2 )

 

What is meant by Transmission Impairments?

 

 

Question No: 54      ( Marks: 3 )

 

Write down names of the control frames in XMODEM.   [3]

 

 

Question No: 55      ( Marks: 3 )

 

What are the fractional T Lines?

 

 

Question No: 56      ( Marks: 3 )

 

 

what is interleaving?

 

Question No: 57      ( Marks: 5 )

 

 

Name and discuss briefly the bits in the HDLC control field. [5]

 

Question No: 58      ( Marks: 5 )

 

 

What is the difference between Digital Data Service (DDS) and Digital

Signal Service (DS)?

 

 

 

Question No: 59      ( Marks: 10 )

 

 

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Give characteristics of switched analog services and leased analog

services.   [5+5]

 

 

Dear Students…

CS601 Current Paper…

Time: 60 min
Marks: 42

Student Info

Student ID:
Center:

Exam Date:

For Teacher’s Use Only

Q No.        1            2            3            4            5            6            7            8          Total

Marks

Q No.        9           10          11          12          13          14          15          16

Marks

Q No.       17          18          19          20          21          22          23          24

Marks

Q No.       25          26          27

Marks

 

 

Question No: 1 ( Marks: 1 ) – Please choose one

 

Effective network mean that the network has fast delivery, timeliness and ► high bandwidth

 

 

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► duplex transmission

► accurate transmission
► low bandwidth

 

 

Question No: 2 ( Marks: 1 ) – Please choose one

 

Which one best describes the given statement:

“To allow multiple users to share total capacity of a transmission medium” ► congestion control

► exchange management
► multiplexing

 

 

Question No: 3 ( Marks: 1 ) – Please choose one

 

A_________ provides a model for development that makes it possible for a product to work regardless of the individual manufacturer.

► protocol

► standard
► topology
► system

 

 

Question No: 4 ( Marks: 1 ) – Please choose one

 

_______ is a multipoint topology.

► Ring

► Mesh
► Tree
► Bus

 

 

Question No: 5 ( Marks: 1 ) – Please choose one

 

_________requires the maximum number of I/O ports.

 

 

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► Bus

► Star
► Mesh
► Ring

 

 

Question No: 6 ( Marks: 1 ) – Please choose one

 

________ topology tells us how networks communicate with one another and how data is transferred.

► logical
► physical

► logical and physical

 

 

Question No: 7 ( Marks: 1 ) – Please choose one

 

Which topology requires a multipoint connection? ► Mesh

► Star
► Bus
► Ring

 

 

Question No: 8 ( Marks: 1 ) – Please choose one

 

Headers are added at layers 1 and 7 of OSI model. ► True

► False

 

 

Question No: 9 ( Marks: 1 ) – Please choose one

 

Internet with small “i” specifies the world wide Network the actual internet. ► True

► False

 

 

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Question No: 10 ( Marks: 1 ) – Please choose one

 

The internet model consists of _________ layers. ► three

► two
► five
► seven

 

 

Question No: 11 ( Marks: 1 ) – Please choose one

 

As the data packet moves from the lower to the upper layers, headers are __________. ► added

► subtracted
► rearranged
► modified

 

 

Question No: 12 ( Marks: 1 ) – Please choose one

 

Data link layer deals with mechanical and electrical specifications of transmission medium and interface

► True

► False

 

 

Question No: 13 ( Marks: 1 ) – Please choose one

 

Which layer is responsible for source to destination delivery of entire message? ► transport layer

► network layer
► session layer
► application layer

 

 

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Question No: 14 ( Marks: 1 ) – Please choose one

 

The inversion of the level at 1 bit is called as __________ ► NRZ-L

► NRZ-I
► RZ

 

 

Question No: 15 ( Marks: 1 ) – Please choose one

 

Which of the encoding schemes have bandwidth problems? ► Differential Manchester

► AMI

► RZ

 

 

Question No: 16 ( Marks: 1 ) – Please choose one

 

Bi phase encoding is a type of bipolar encoding in which we use two voltage levels. ► True

► False

 

 

Question No: 17 ( Marks: 1 ) – Please choose one

 

ASK require a minimum bandwidth equal to its baud rate. ► True

► False

 

 

Question No: 18 ( Marks: 1 ) – Please choose one

 

A 56k modem can download at a rate of __________ Kbps and upload at a rate of __________ Kbps.

► 33.6: 33.6

► 33.6: 56.6

 

 

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► 56.6: 33.6

► 56.6: 56.6

 

 

Question No: 19 ( Marks: 1 ) – Please choose one

 

In ____________ transmission the timing of the signal is unimportant. ► Asynchronous

► Synchronous
► Polar

► Bi-polar

 

 

Question No: 20 ( Marks: 1 ) – Please choose one

 

There are _________________ basic functional units involved in the communication of
data.

► 3
► 1
► 2
► 4

 

 

Question No: 21 ( Marks: 1 ) – Please choose one

 

At the ______________layer, a DCE takes data generated by a DTE. ► physical

► transport
► data link
► application

 

 

Question No: 22 ( Marks: 1 ) – Please choose one

 

The last modified version of EIA-232 standard is ______________ ► EIA-232 D

 

 

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► EIA-232 A

► EIA-232 B
► EIA-232 C

 

 

Question No: 23 ( Marks: 1 ) – Please choose one

 

Traditional telephony lines carry frequencies btw 300 Hz and 3300 Hz giving them a bandwidth of 3000 Hz.

► 3100

► 3000
► 3200
► 3300

 

 

Question No: 24 ( Marks: 1 ) – Please choose one

 

We need ____________ to decompose a composite signal into its components. ► fourier transform

► nyquist theorem
► shannon capacity

 

 

Question No: 25 ( Marks: 3 )

 

At which layer synchronization of Bits occur and how?

Question No: 26 ( Marks: 5 )

 

What is meant by Zero Frequency and Infinite Frequency?

Question No: 27 ( Marks: 10 )

 

Describe functions of each layer of OSI Model briefly?

 

 

Top

 

 

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MIDTERM   EXAMINATION
Spring 2009

CS601- Data Communication (Session – 2)

Ref No: 448559
Time: 60 min
Marks: 40

 

For Teacher’s Use Only

Q         1            2            3            4            5            6            7            8          Total

No.

Marks

Q No.        9           10          11          12          13          14          15          16

Marks

Q No.       17          18          19          20          21          22          23          24

Marks

 

 

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Question No: 1     ( Marks: 1 )     – Please choose one

The last modified version of EIA-232 standard is ______________
► EIA-232 D

► EIA-232 A
► EIA-232 B
► EIA-232 C

Question No: 2     ( Marks: 1 )     – Please choose one

_________ require more bandwidth.

► FSK

► ASK
► PSK
► QAM

Question No: 3     ( Marks: 1 )     – Please choose one

ASK, PSK, FSK and QAM are examples of ____________ modulation.

► digital-to-digital

► digital-to-analog
► analog-to-analog
► analog-to-digital

 

 

Question No: 4     ( Marks: 1 )     – Please choose one

Amplitude in ASK is more resistive to EMI and Noise.        º True

º False

 

Question No: 5     ( Marks: 1 )     – Please choose one

The inversion of the level at 1 bit is called as __________
► NRZ-L

► NRZ-I
► RZ

Question No: 6     ( Marks: 1 )     – Please choose one

Manchester is a type of ____________encoding.
► biphase

► polar

► biphase & polar
► none of the given

Question No: 7     ( Marks: 1 )     – Please choose one

Zero crossing bandwidth is also called as equivalent noise bandwidth.
► True

► False

 

 

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Question No: 8     ( Marks: 1 )     – Please choose one

A periodic signal can always be decomposed into _____________

► exactly an odd number of sine waves

► a set of sine waves

►   set of sine waves, one of the which must have a phase of 00 ► none of the given

 

Question No: 9     ( Marks: 1 )     – Please choose one

Data must be converted into__________ before transmission.

º signal

º wave

º electric pulse

Question No: 10     ( Marks: 1 )     – Please choose one

A signal that repeats a pattern over a regular interval of time is called_______.
► periodic signal

► analog signal

► composite signal

Question No: 11     ( Marks: 1 )     – Please choose one

Fourier transform tells us that any digital signal can be decomposed into infinite number of periodic signals

► True

► False

Question No: 12     ( Marks: 1 )     – Please choose one

When data are transmitted from device A to device B, the header from A’s layer 4 is read by B’s __________ layer.

► physical

► transport
► application

► none of the given

 

 

Question No: 13     ( Marks: 1 )     – Please choose one

________ layer deals with syntax and semantics of information exchange.        º presentation

º session

º application
º physical

Question No: 14     ( Marks: 1 )     – Please choose one

Which layer is responsible for source to destination delivery of entire message?

 

 

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► transport layer

► network layer
► session layer
► application layer

Question No: 15     ( Marks: 1 )     – Please choose one

Line configuration is the function of ____________ layer

► data link

► network
► physical
► transport

Question No: 16     ( Marks: 1 )     – Please choose one

__________representation of links that connect nodes is called as physical topology.

► geometrical
► logical

► physical

 

Question No: 17     ( Marks: 1 )     – Please choose one

________ topology tells us how networks communicate with one another and how data is transferred.

► logical

► physical

► logical and physical

 

Question No: 18     ( Marks: 1 )     – Please choose one

_________requires the maximum number of I/O ports.
► Bus

► Star
► Mesh
► Ring

Question No: 19     ( Marks: 1 )     – Please choose one

Which one is not among standard creation committee.

► internet society and IETF

► ITU-T

►   IEEE

Question No: 20     ( Marks: 1 )     – Please choose one

Frequency of a failure and network recovery time after a failure are measures of the ____________ of a network.

► Performance

 

 

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► Reliability

► Security
► Feasibility

Question No: 21     ( Marks: 2 )

What relationships are possible in a network?

Question No: 22     ( Marks: 3 )

When and why recovery techniques are required in data communication?

 

Question No: 23     ( Marks: 5 )

Differentiates between the following terms. [10 marks]

(a) Syntax and Semantics of protocol.

(b) Network management and exchange management.

(c) Monolithic and structured.

 

Question No: 24     ( Marks: 10 )

Compare time and frequency domain plots with suitable examples?

 

Top

 

 

 

 

 

 

/wEPDwUKMTY2N

 

 

 

 

Quiz Start Time: 11:37 AM

 

Question # 1 of 10 ( Start time: 11:37:44 AM )

For point-to-point configuration, addressing is needed

Select correct option:

 

True

 

False

 

 

 

 

/wEWBAKFvdSaD   /wEPDwUKMTY2N

 

 

 

 

 

Quiz Start Time: 11:37 AM

Total Marks: 1

 

 

 

 

 

 

 

 

 

 

Click here to Save Answer & Move to Next Question

 

 

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Question # 2 of 10 ( Start time: 11:38:27 AM )                                                                               Total Marks: 1

In __________ ARQ, if a NAK is received, only the specific damaged or lost frame is retransmitted.

Select correct option:

 

Stop and Wait

 

Go-Back-N

 

Selective repeat

 

Stop-and-wait & Go-back-N

 

Click here to Save Answer & Move to Next Question

 

/wEWBgLBivmxC    /wEPDwUKMTY2N

 

 

 

 

 

Quiz Start Time: 11:37 AM

Question # 3 of 10 ( Start time: 11:39:07 AM )                                                                               Total Marks: 1

Sliding window requires that data frames be transmitted _______________

Select correct option:

 

Sequentially

 

Frequently

Asynchronously
Non of the given

 

Click here to Save Answer & Move to Next Question

 

/wEWBgKIr6CLBg /wEPDwUKMTY2N

 

 

 

 

 

Quiz Start Time: 11:37 AM

Question # 4 of 10 ( Start time: 11:40:37 AM )                                                                               Total Marks: 1

Which one is not the function of data link layer?

Select correct option:

 

Line discipline

 

Flow control

 

 

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Error control

 

Network control

 

Click here to Save Answer & Move to Next Question

 

/wEWBgKWy4TP    /wEPDwUKMTY2N

 

 

 

 

 

Quiz Start Time: 11:37 AM

 

Question # 5 of 10 ( Start time: 11:40:53 AM )

Flow control is needed to prevent ___________.

Select correct option:

 

Bit errors

 

Overflow of the sender buffer

 

Overflow of the receiver buffer

 

Collision between sender and receiver

 

 

 

 

/wEWBgLYmOaZA  /wEPDwUKMTY2N

 

 

 

 

 

Quiz Start Time: 11:37 AM

Question # 6 of 10 ( Start time: 11:42:09 AM )

Total Marks: 1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Click here to Save Answer & Move to Next Question

 

 

 

 

 

 

 

 

Total Marks: 1

 

Error control in the data link layer is based on _______________.

Select correct option:

 

automatic repeat request

automatic repeat acknowledgment
automatic send acknowledgment
automatic send request

 

Click here to Save Answer & Move to Next Question

 

/wEWBgKdh9uED   /wEPDwUKMTY2N

 

 

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Quiz Start Time: 11:37 AM

Question # 7 of 10 ( Start time: 11:43:29 AM )                                                                               Total Marks: 1

Data link protocols can be divided into ______________ sub-groups.

Select correct option:

 

two

three
four
five

 

Click here to Save Answer & Move to Next Question

 

/wEWBgLm+qmrC     /wEPDwUKMTY2N

 

 

 

 

 

Quiz Start Time: 11:37 AM

Question # 8 of 10 ( Start time: 11:43:50 AM )                                                                               Total Marks: 1

For stop-and-wait ARQ, for n data packets sent, ___________ acknowledgments are needed.

Select correct option:

 

n

 

2n

N-1
N+1

 

Click here to Save Answer & Move to Next Question

 

/wEWBgL70P1IAr   /wEPDwUKMTY2N

 

 

 

 

 

Quiz Start Time: 11:37 AM

Question # 9 of 10 ( Start time: 11:45:20 AM )                                                                               Total Marks: 1

In a Go-Back-N ARQ, if the window size is 63, what is the range of sequence number?

Select correct option:

 

 

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0 to 63

0 to 64
1 to 63
1 to 64

 

Click here to Save Answer & Move to Next Question

 

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Quiz Start Time: 11:37 AM

Question # 10 of 10 ( Start time: 11:46:52 AM )                                                                            Total Marks: 1

In data link layer, communication requires at least ___________ devices working together.

Select correct option:

 

3

2
4
1

 

Click here to Save Answer & Move to Next Question

 

/wEWBgLFg9GvB   /wEPDwUKMTY2N

 

 

 

 

 

Quiz Start Time: 11:52 AM

Question # 1 of 10 ( Start time: 11:52:19 AM )                                                                               Total Marks: 1

A timer is set when ___________ is (are) sent out.

Select correct option:

 

A data frame

 

An ACK

 

A NAK

 

All of given

 

 

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Click here to Save Answer & Move to Next Question

 

/wEWBgLzutK0Bg /wEPDwUKMTY2N

 

 

 

 

 

Quiz Start Time: 11:52 AM

 

Question # 3 of 10 ( Start time: 11:54:31 AM )

Flow control is needed to prevent ____________.

Select correct option:

 

Collision between sender and receiver

 

Overflow of the receiver buffer

 

Overflow of the sender buffer

 

Bit errors

 

 

 

 

/wEWBgKEmL6AA  /wEPDwUKMTY2N

 

 

 

 

 

Quiz Start Time: 11:52 AM

Question # 4 of 10 ( Start time: 11:55:39 AM )

Total Marks: 1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Click here to Save Answer & Move to Next Question

 

 

 

 

 

 

 

 

Total Marks: 1

 

In selective-reject ARQ, only the specific damaged or lost frame is_______________.

Select correct option:

 

r

e
tr
a
n
s

m
it

t

e
d

 

 

 

Click here to Save Answer & Move to Next Question

 

/wEWBgLCoY/iAg /wEPDwUKMTY2N

 

 

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Quiz Start Time: 11:52 AM

Question # 5 of 10 ( Start time: 11:56:13 AM )                                                                               Total Marks: 1

If the primary wants to receive data, it asks the second-arise if they have anything to send, this is called

Select correct option:

 

POLLING

 

SELECTING

 

Click here to Save Answer & Move to Next Question

 

/wEWBAK3upDD    /wEPDwUKMTY2N

 

 

 

 

 

Quiz Start Time: 11:52 AM

Question # 10 of 10 ( Start time: 12:02:01 PM )                                                                            Total Marks: 1

Data link control is composed of ____________ important functions.

Select correct option:

 

2

3
4
5

 

Click here to Save Answer & Move to Next Question

 

/wEWBgLU+4+F    /wEPDwUKMTY2N

 

 

 

 

 

Quiz Start Time: 12:10 PM

Question # 5 of 10 ( Start time: 12:12:08 PM )                                                                               Total Marks: 1

Which error detection method consists of just one redundant bit per data unit?

Select correct option:

 

Simple parity check

 

 

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Two-dimensional parity check

 

CRC

 

Checksum

 

Click here to Save Answer & Move to Next Question

 

/wEWBgLNyd6bD /wEPDwUKMTY2N

 

 

 

 

 

Quiz Start Time: 12:10 PM

Question # 6 of 10 ( Start time: 12:13:39 PM )                                                                               Total Marks: 1

In Go-Back-N ARQ, if frames  4,  5 and  6 are received successfully, the receiver may send an ACK ___________ to the sender.

Select correct option:

 

5

6
7

 

Any of the given

 

Click here to Save Answer & Move to Next Question

 

/wEWBgLA/O+3C   /wEPDwUKMTY2N

 

 

 

 

 

Quiz Start Time: 12:10 PM

Question # 7 of 10 ( Start time: 12:14:36 PM )                                                                               Total Marks: 1

If the data unit is 111111 and the divisor is 1010, what is the dividend at the transmitter?

Select correct option:

 

111111000

1111110000
111111

 

1111111010

 

Click here to Save Answer & Move to Next Question

 

 

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/wEWBgKt+YqbD /wEPDwUKMTY2N

 

 

 

 

 

Quiz Start Time: 12:10 PM

 

Question # 8 of 10 ( Start time: 12:16:06 PM )

ARQ stands for ___________

Select correct option:

 

Automatic repeat quantization

 

Automatic repeat request

 

Automatic retransmission request

 

Acknowledge repeat request.

 

 

 

 

/wEWBgLAjPHDA   /wEPDwUKMTY2N

 

 

 

 

 

Quiz Start Time: 12:10 PM

Question # 9 of 10 ( Start time: 12:16:31 PM )

Total Marks: 1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Click here to Save Answer & Move to Next Question

 

 

 

 

 

 

 

 

Total Marks: 1

 

For a sliding window of size n-1 (n sequence numbers), there can be a maximum of __________ frames sent but unacknowledged.

Select correct option:

 

0

N-1
N

 

N+1

 

Click here to Save Answer & Move to Next Question

 

/wEWBgLinpqjDg /wEPDwUKMTY2N

 

 

 

 

 

Quiz Start Time: 12:18 PM

Question # 6 of 10 ( Start time: 12:20:15 PM )                                                                               Total Marks: 1

 

 

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In Full-duplex, the initiator sends data while the responder waits

Select correct option:

 

True

 

False

 

Click here to Save Answer & Move to Next Question

 

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Quiz Start Time: 12:18 PM

Question # 10 of 10 ( Start time: 12:21:10 PM )                                                                            Total Marks: 1

In CRC there is no error if the remainder at the receiver is _________.

Select correct option:

Equal to the remainder at the sender
Zero

 

NonZero

 

The quotient at the sender

 

Click here to Save Answer & Move to Next Question

 

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Quiz Start Time: 12:22 PM

Question # 6 of 10 ( Start time: 12:22:41 PM )                                                                               Total Marks: 1

Error control in the data link layer is based on _______________.

Select correct option:

 

automatic repeat request

automatic repeat acknowledgment
automatic send acknowledgment
automatic send request

 

 

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Click here to Save Answer & Move to Next Question

 

/wEWBgKjtttQAr    /wEPDwUKMTY2N

 

 

 

 

 

Quiz Start Time: 12:22 PM

 

Question # 8 of 10 ( Start time: 12:23:17 PM )

Flow Control is the responsibility of _________

Select correct option:

 

Network Layer

 

Transport Layer

 

Data Link Layer

 

Physical Layer

 

 

 

 

/wEWBgLgxMW9    /wEPDwUKMTY2N

 

 

 

 

 

Quiz Start Time: 12:25 PM

Question # 2 of 10 ( Start time: 12:26:03 PM )
The Hamming code is a method of __________.

Select correct option:

 

Error detection

 

Error correction

 

Error encapsulation

 

Error detection & error encapsulation

 

 

 

 

/wEWBgKmwvq2    /wEPDwUKMTY2N

 

 

 

 

 

Quiz Start Time: 12:25 PM

Total Marks: 1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Click here to Save Answer & Move to Next Question

 

 

 

 

 

 

 

 

Total Marks: 1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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Question # 10 of 10 ( Start time: 12:27:40 PM )                                                                            Total Marks: 1

In __________ ARQ, if a NAK is received, only the specific damaged or lost frame is retransmitted.

Select correct option:

 

Stop and Wait

 

Go-Back-N

 

Selective repeat

 

Stop-and-wait & Go-back-N

 

Click here to Save Answer & Move to Next Question

 

/wEWBgKTsqnIB

 

 

 

Top

 

 

 

CS 601 DATA COMMUNICATION
FALL 2009 – 12 FEB 2010

Question # 1 of 10

In FDDI, THT stands for:

      Token Hash Timer

      Tier Holding Timer

      Target Holding Timer

      Token Holding Timer

Question # 2 of 10

The DSAP and SSAP are addresses used by ____to identify the protocol stack.

      Network

      MAC

      LLC

      None of the above

Question # 3 of 10

Repeaters work on the ____Layer/Layers

 

 

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      Data Link

      Physical

      Network

      All of the above

Question # 4 of 10

Bridge is _____ Layer Device

      Data Link

      Physical

      Network

      None of the above

Question # 5 of 10

On the transport layer of TCP/IP suit_____ protocols are used

      TCP & IP

      TCP & UDP

Question # 6 of 10

Application layer of TCP/IP suit is equivalent of _____layers of OSI Model

      Application, Presentation and Transport

      Application, Session and Transport

      Application, Presentation and Session

      None of the above

Question # 7 of 10

A Repeater does not allow us to extend the physical length of network

      True

      False

Question # 8 of 10

Shortest frame in HDLC protocols is usually the ____ frame.

 

VU CS601 – DATA COMMUNICATION FINALTERM Solved Unsolved Past Papers

VU CS601 – DATA COMMUNICATION FINALTERM solved unsolved past papers SPRING 2011

VU CS601 – DATA COMMUNICATION FINALTERM Solved Unsolved Past Papers SPRING 2011

 

 

 

CS601-Data Communication

 

Latest Solved subjective from Final term Papers

 

 

FINAL TERM EXAMINATION

SPRING 2011

 

What is the difference between guided and unguided media?

Answer:             Click here for detail

Guided Media are those media that provide a conduit from one device to another. Guided

Transmission Media uses a “cabling” system that guides the data signals along a specific path while
Unguided Transmission Media consists of a means for the data signals to travel but nothing to guide
them along a specific path. It passes through a vacuum; it is independent of a physical pathway.

 

Write Commercial advantage and characteristics of token bus

Answer: (Page 232)

Ø   Other LANs are not suitable for this purpose

Ø   Token Bus has no commercial application in data communications Ø   Token Ring allows each station to send one frame per turn
Ø   Access method: Token passing

What is the difference between FDM and TDM

Answer:    Click here for detail

1) FDM-Frequency division multiplexing where as TDM mean Time division Multiplexing.

2) In FDM spectrum is divided into frequency whereas in TDM divided into time slot.

3) FDM is used in 1st generation analog system whereas TDM is used in 2nd generation analog system.

 

Write the types transmission noise

Answer: (Page 143)

Thermal Noise: Due to random originally sent by TX

Induced Noise: Comes from sources like Motors and Appliances Crosstalk:  Effect of one wire on another

Impulse Noise: Spike (A signal with high energy in a very short period of timepower lines, lightening
etc.

 

What is power bandwidth

Answer:  Click here for detail

The power bandwidth of an amplifier is sometimes taken as the frequency range (or, rarely, the

upper frequency limit) for which the rated power output of an amplifier can be maintained (without excessive distortion) to at least half of the full rated power.

OR

 

 

 

 

Power Bandwidth

Answer: (Page 67)

Frequency band in which 99% of the total power resides.

 

What does the CRC generator append to data unit? [2]

Answer: (Page 175)

Appending it to the end of the data must make the resulting bit sequence exactly divisible by the divisor

How much bandwidth for modem is required in case of FSK? [2]

Answer:

BW required for FSK is equal to the Baud rate of the signal plus the frequency shift.

Because of the limitations of voice-grade telephone lines, these modems are restricted to a bandwidth of about 3 kHz

 

What is even parity generator in VRC error detection mechanism? [2]

Answer: (Page 172)

Even parity generator counts the 1‟s and appends the parity bit (1) to the end.

What is the difference between angle of incident and angle of reflection? [2]

Answer: (Page 126)

The difference between them is that Angle of refraction passes from less dense to denser medium whereas angle of incidence passes from more dense to less dense medium.

What is daisy chaining in 1Base 5 star Lan? [2]

Answer: (Page 229)

Slower speed in star lan can be increase by the use of DAISY CHAINING.

 

What is the responsibility of Application layer? [3]

Answer: Page 53

Enables the user either human or software to access the network

It provides user interface and support for the services such as Electronic mail, Remote File access and Transfer, Shared Database Management and other services

 

What is critical angle?

Answer: (Page 127)

We have a beam of light moving from a more dense to a less dense medium. We gradually

increase the angle of incidence measured from vertical axis.  As angle of incidence increases, so does the angle of refraction.

The angle at which refracted line lies on the horizontal axis is called Critical Angle

 

Hamming code-Redundancy bit (5 marks Q)

Answer: (Page 181)

Redundancy Bits (r)

Ø   r must be able to indicate at least m+r+1 states Ø   m+r+1 states must be discoverable by r bits Ø   Therefore, 2r ≥  m+r+1

 

 

 

 

Ø   If m=7, r=4 as 24 ≥  7+4+1

 

Tree topology advantages (3 or 5 marks)

Answer: (Page 31)

Ø   Because of Secondary Hub, More devices can be attached to a Central Hub and
therefore increase the distance a signal can travel

Ø   Enables    Differentiated    Services:    Allows    to    prioritize    communication,    e.g. computers
attached to one secondary hub can be given priority over others

Ø   Therefore, TIME SENSITIVE data will not have to wait for access to the network Ø   Rest of the advantages are almost the same as STAR

 

Q #41:  Whether VRC error detection method is used for single bit error or burst error. (2)

Answer: (Page 173)

VRC can detect all single bit errors

Can also detect Burst errors as long as the total number of bits changed is ODD

 

Q # 42: Which modem was first developed commercially in 1970? (2)

Answer: (Page 114)

Bell modems

-First commercial modems by Bell Telephone Co. -Developed in early 1970s

Q # 45: Consider a major telecom company using RZ encoding for its signals
conversion. What will be  the major problem faced by using such type of

encoding? (2)

Answer: (Page 75)

Any time, data contains long strings of 1’s or 0’s, Rx can loose its timing.

The only problem with RZ encoding is that it requires two signal changes to encode one bit and therefore occupies more BANDWIDTH

 

Q # 47: Geosynchronous Satellite? (3)

Answer: (Page 139)

Ø   Line of sight propagation requires the sending and receiving antennas must be locked into
each other

Ø   To ensure continuous communication, satellites must move with the same speed as earth. So
that they seem fixes w.r.t earth

Ø   These satellites are called Geosynchronous Satellites

 

 

 

 

 

FINAL TERM EXAMINATION 2011

 

Question#1

What are the Asynchronous protocols in data communication layer? ………….Marks (10)

Answer:   (Page 206)

Asynchronous protocols Treat each character in a Bit stream independently. Employed mainly in Modems.

Transmission does not require timing coordination; Timing is done by using extra bits

Different Asynchronous Protocols

XMODEM

o  The first field is a One Byte start of header (SOH) field o  The second field is a two-byte Header.

-The first header byte , the Sequence number carries the Frame number

-The second header byte is used to check the validity of the sequence number

 

o  The fixed data field holds 128 bytes of data

o  The last field CRC checks for errors in the data field only

YMODEM

YMODEM is similar to X-MODEM with only the following major differences:

o 1024-Byte data unit

o  Two CANs to abort Transmission

o  ITU-T CRC-16 for Error Checking

o  Multiple files can be sent simultaneously

 

ZMODEM :

Newer Protocol

Combines features of XMODEM    and YMODEM.

 

BLAST

o  Blocked Asynchronous Transmission
o  More powerful than XMODEM
o  Full Duplex

o  Sliding Window Flow Control

o  Allows transfer of Data and Binary Files

KERMIT

o  Designed at Columbia University

o  Most Widely used Asynchronous Protocol

o  File Transfer protocol is similar in operation to XMODEM, with sender waiting for an
NAK before it starts TX

o  Kermit allows the transmission of control characters as Text

 

 

 

 

 

Question#2

What is Frequency division multiplexing ?…… .Marks (5)

Answer:      (Page 149)

Frequency division multiplexing (FDM)

o  An analog technique that can be applied when BW of the link is greater than the combined
BW of the signals to be TX

o  Signals generated by each sending device modulate difference carrier frequencies o  These modulated signals are then combined into a single Composite signal that
can be transported by the link

o  Carrier frequencies are separated by enough BW to accommodate the modulated signal o  These BW ranges are the channels through which the various signals travel

 

 

Question#4

What is stop and wait ARQ in error control ?….Marks (3)

Answer: Page 197

Stop-and-Wait is an extended form of flow control to include retransmission of data in case of Lost or Damaged frames.

There are four main features added in it.

1.  Sending device keeps a copy of the last frame transmitted until it receives the ACK for that
frame.

2.  Both data and ACK frames are numbered 0 and 1 alternately.

3.  A data 0 frame is acknowledged by a ACK 1 frame indicating that the receiver has received data
0 and is now expecting data 1 .

4.  For retransmission to work, 4 features are added to the basic flow control mechanism.

 

Question#5

What is Interleaving ?…    ..Marks (3)

Answer: Page 153

Synchronous TDM is considered as a very fast rotating switch. When this switch opens in front of a
device, the device has the opportunity to send a specific amount of data on to the path.
The switch moves from device to device at a constant rate and in a fixed order. This process is called
INTERLEAVING. Interleaving can be done by BITS, BYTES or by any other DATA UNIT

Question#6

What is DSU in terms of digital services?…    …Marks (3)

Answer: Page 163

DSU (Digital service unit) changes the rate of digital data created by the subscriber’s device to 56 Kbps and encodes it in the format used by service provider. It used in dialing process and is more expensive than MODEM. But it has better speed, better quality and less susceptibility to noise.

 

Question#7

Which architecture of Ethernet developed by ITU_T and

ANSI?…….. .. Marks (2)

Answer: 236

FDDI (Fiber Distributed Data Interface)architecture of Ethernet developed by ITU_T and ANSI.

 

 

 

 

 

Question#8

What is a spike in noise term?…    …Marks (2)

Answer:143

Spike is a signal with high energy in a very short period of time that comes from power lines, lightening etc,

 

Question#9

Answer: Page 172

What is even parity generator in VRC error detection mechanism?…       ..Marks (2)

Even parity generator counts the 1’s and appends the parity bit (1) to the end.

 

Question#10

Compare line discipline methods ENQ/ACK and Poll/ Select? Answer:  Page 188-189

=>ENQ/ACK coordinates which device may start a transmission and whether or not the intended recipient is ready and enabled.

=> Using ENQ/ACK, a session can be initiated by either station on a link as long as both are of equal
rank.

=> In both half-duplex and full-duplex transmission, the initiating device establishes the session.

=> In half duplex, the initiator then sends its data while the responder waits. The responder may take over the link when the initiator is finished or has requested a response.

=> In full duplex, both devices can transmit simultaneously once the session has been established.

 

POLL/SELECT:

 

=> The poll/select method of line discipline works with topologies where one device is designated as a primary station and the other devices are secondary stations.

=> Multipoint systems must coordinate several nodes, not just two.

=> The primary device controls the link and the secondary device follow sits instruction

It is up to the primary to determine which device is allowed to use the channel data given time

 

 

Why addressing is required in Poll / Select method and not required in ENQ/ACK method?3 Answer:   (Page 190)

Addressing is required in Poll / Select method as it is a not point-to-point configuration, For the primary device in a multipoint topology to be able to identify and communicate with a specific secondary
device, there must be some addressing, while ENQ/ACK method  is a point-to-point  method and for point-to-point configuration, there is no need for addressing.

 

 

What do you know about ITU-T Modems?3

Answer:      (Page 114)

ITU-T modem :

V-series: Today’s most popular modem standards
Bell modem compatible:

V.21/22/23/26/27/29

 

 

 

 

 

Following abbreviations stands for what?3

Answer: (Page 224)

ARP…….…. (Address Resolution Protocol)

RARP……… (Reverse Address Resolution Protocol)
ICMP ……… (Internet Control Message Protocol)

 

Write names of Link Access Protocols developed by ITU-T?3

Answer:   (Page 211)

LAPs: LAPB, LAPD, LAPM, LAPZ etc. all based on HDLC

 

Write the names of different types of noise in the medium?3

Answer:     (Page 144)

Thermal Noise
Induced Noise
Crosstalk

Impulse Noise

Write down some disadvantages of star topology.3

Answer: (Page 30)

Although Cabling required is far less than Mesh

Still each node must be connected to a Hub , so Cabling is still much more

What are the two major classes of synchronous protocols at data link layer?2

Answer: (Page 206)

Character – Oriented Protocols
Bit – Oriented Protocols

Whether Hamming code is the technique used for error detection or error correction?2

Answer: (Page 181)

Hamming code is the technique used for error correction

 

Define Multiplexing? What is its advantage?2

Answer: (Page 147)

Set of techniques that allows the simultaneous transmission of multiple signals across a single data link

It allows multiple users to share total capacity of a Transmission Medium.

What is the purpose of dual ring?2

Answer: (Page 34)

Unidirectional traffic movement is overcome by dual ring technology.

 

Which modem was first  developed commercially in 1970?2

Answer: (Page 114)

Bell modems

 

Write any two functions of physical layer?2

Answer: (Page 45)

 

 

 

 

It defines characteristics of Interface between device and transmission Medium It also defines the type of transmission medium

Physical Layer is also concerned with Line Configuration

 

 

FINAL TERM EXAMINATION

2011

 

Which one has more overhead, a repeater or a bridge? Explain your answer. [3]

Answer:

A bridge has more overhead than a repeater. A bridge processes the packet at two layers; a repeater processes a frame at only one layer. A bridge needs to search a table and find the forwarding port as well as to regenerate the signal; a repeater only regenerates the signal. In other words, a bridge is also a repeater (and more); a repeater is not a bridge

Define high frequency [HF] and super high frequency [SHF], which devices uses these frequencies [3]

Answer: Page 135 and 136

High frequency.

HF uses ionospheric propagation. These frequencies move into the ionosphere where the density difference reflects them back on earth.

It is used for Citizen’s Band Radio, International Broadcasting, Military Communication, Telephone, Telegraph and Fax

Super high frequency.

SHF waves are TX using mostly line-of-sight and some Space propagation.

It is used for Terrestrial and Satellite Microwave and Radar Communication devices.

 

Write all steps of checksum method. [3]

Answer: (Page 179)

o The sender subdivides data units into equal segments of ‘n’ bits(16 bits) o These segments are added together using one’s complement

o The total (sum) is then complemented and appended to the end of the original data unit as redundancy bits called CHECKSUM

o The extended data unit is transmitted across the network

o The receiver subdivides data unit as above and adds all segments together and complement the result o If the intended data unit is intact, total value found by adding the data segments and the checksum field should be zero o If the result is not zero, the packet contains an error & the receiver rejects it

 

Differentiate internet and the internet? [3]

Answer:   (Page 240)

INTERNET

o  An internet is a generic term used to mean an interconnection of individual networks o  To create an internet, we need networking devices called routers and gateways
o  An internet is different from the Internet

o  Internet is the name of a specific worldwide network

 

 

 

 

 

What is the differences in between bit oriented and character oriented protocols [5]

Answer:   (Page 206)

Character – Oriented Protocols

o  Also called Byte- Oriented Protocol

o  These protocols interpret a transmission frame or packet as a succession of characters,
each usually composed of one byte

o  All control information is in the form of an existing character encoding system

Bit – Oriented Protocols

o  Character -Oriented Protocols are not as efficient as bit – oriented protocols and are seldom used o  They are easy to comprehend and employ the same logic as bit-oriented protocols
o  Their study will provide the basis for studying the other data link layer protocols
o  IBN’s BSC is the best known character oriented protocol

 

FINAL TERM EXAMINATION

2011

Question#1

What is the formula to calculate the number of redundancy bits required to correct a bit error in a given number of data bits? [2]

Answer:              Click here for detail

Messages(frames) consist of m data (message) bits, yielding an n=(m+r)-bit codeword.

 

Question#2

What is R G rating of coaxial cable?

Answer:-      (Page 126)

Different coaxial cable designs are categorized by their Radio government ( RG ) ratings

Each cable defined by RG rating is adapted for a specialized function: RG-8

   Used in Thick Ethernet
RG-9

   Used in Thick Ethernet
RG-11

   Used in Thick Ethernet
RG-58

   Used in Thin Ethernet
RG-59

   Used for TV

 

Question#3

What are the advantages of thin Ethernet?

Answer:      (Page 228)

The advantages of thin Ethernet are:

1.  reduced cost

2.  ease of installation

Because the cable is lighter weight and more flexible than that used in Thick net

 

 

 

 

 

Question#4

What is the difference between a unicast, multicast, and broadcast address? [3]

Answer:          Click here for detail

Broadcast: transmitting a packet that will be received by every device on the network Unicast: the sending of information packets to a single destination
Multicast: delivery of information to a group of destinations.
Question#5

T lines are designed for Digital data how they can be used for Analog Transmission?

Answer:     (Page 166)

o DS-1 requires 8 Kbps of overhead

o To understand this overhead, let’s examine format of a 24-voice channel frame

o Frame used on T-1 line is usually 193 bits divided into 24 slots of 8 bits each + 1 bit for synchronization (24*8+1=193)

o 24 segments are interleaved in one frame

o If a T-1 carries 8000 frames, the data rate is 1.544 Mbps (193 * 8000=1.544 Mbps) which is capacity of the line

Question#6

What are the three types of Guided Media?

Answer:        (Page 120)

1.  Coaxial cable

2.  Twisted-pair cable

3.  Fiber optic cable.

 

Question#7

Why do we need Inverse Multiplexing? [5]

Answer:        (Page 159)

   An organization wants to send data, voice and video each of which requires a different data rate    To send voice it needs 64Kbps,

   To send data, it needs 128 Kbps link

   To send video it may need 1.544 Mbps link

   It can lease a 1.544 Mbps line from a common carrier and only use it fully for sometime    Or it can lease several separate channels of lower data rates

   Voice can be sent over any of these channels

   Data & Video can be broken into smaller portions using Inverse Multiplexing and TX

 

Question#8

Describe method of checksum briefly?

Answer:         (Page 180)

o The sender subdivides data units into equal segments of ‘n’ bits(16 bits) o These segments are added together using one’s complement

o The total (sum) is then complemented and appended to the end of the original data unit as redundancy bits called CHECKSUM

o The extended data unit is transmitted across the network

o The receiver subdivides data unit as above and adds all segments together and complement the result o If the intended data unit is intact, total value found by adding the data segments and the checksum field should be zero o If the result is not zero, the packet contains an error & the receiver rejects it

 

 

 

 

 

Question#9

Explain Asynchronous Time Division Multiplexing in detail? Also discuss its advantages over synchronous TDM?

Answer:

Asynchronous time-division multiplexing (ATDM) is a method of sending information that resembles
normal TDM, except that time slots are allocated as needed dynamically rather than pre-assigned to
specific transmitters. ATDM is more intelligent and has better bandwidth efficiency than TDM.
asynchronous time-division multiplexing comprising receive circuits (CRl/i) supplying cells received
via input links, transmit circuits (CTl/j) transmitting retransmitted cells on output links, a buffer
memory (MT) storing the received cells and delivering the cells to be retransmitted and a buffer
memory addressing device (SMT) including a write address source (SAE) and a read address source
(fsl/j).

 

Advantages asynchronous TDM:

In asynchronous TDM, the timeslots are not fixed. They are assigned dynamically as needed.

The objective would be to switch from one user to another user whenever the one user is idle, and to
asynchronously time multiplex the data. With such an arrangement, each user would be granted access
to the channel only when he has a message to transmit. This is known as an Asynchronous Time
Division Multiplexing System (ATDM). A segment of a typical ATDM data stream is shown in Figure

2. The crucial attributes of such a multiplexing technique are:

1. An address is required for each transmitted message, and

2. Buffering is required to handle the random message arrivals.

 

 

FINAL TERM EXAMINATION

2011

 

Question No: 31      ( Marks: 2 )

What is hybrid topology?

Answer:

Hybrid topology is a kind of topology, In which Several topologies combined in a larger topology

 

Question No: 32      ( Marks: 2 )

What is combined station of HDLC?

Answer: (Page 211)

A combined station is one of a set of connected peer devices programmed to behave either as a primary or as a secondary depending on the nature and the direction of the transmission.

Question No: 33      ( Marks: 2 )

What kind of error is undetectable by the checksum?

Answer: (Page 180)

Error is invisible if a bit inversion is balanced by an opposite bit inversion in the corresponding digit of another segment

 

Question No: 34      ( Marks: 2 )

What’s the name of the telephone service in which there is no need of dialing?

Answer: (Page 161)

 

 

 

 

In Analog Leased Service there is no need of dialing

 

Question No: 35      ( Marks: 3 )

How Bit Rate & Baud rate are related?

Answer: (Page 85)

Bit rate equals the baud rate times the no. of bits represented by each signal unit.

The baud rate equals the bit rate divided by the no. of bits represented by each signal shift. Bit rate is always greater than or equal to Baud rate

 

Question No: 36      ( Marks: 3 )

Following abbreviations stands for what?

Answer: (Page244)

1.  ARP: Address Resolution Protocol

2.  RARP: Reverse Address Resolution Protocol

3.  ICMP: Internet Control Message Protocol

 

Question No: 37      ( Marks: 3 )

Differentiate between Polling and Selecting.

Answer:   (Page 189)

If the primary wants to receive data, it asks the second-arise if they have anything to send, This is called Polling

If the primary wants to send data, it tells the target secondary to get ready to receive, This function is called Selecting.

 

Question No: 38      ( Marks: 3 )

T lines are designed for Digital data how they can be used for Analog Transmission?

Answer: repeat

 

Question No: 39      ( Marks: 5 )

What is the difference between character oriented and bit oriented protocols?

Answer: repeat

 

Question No: 40      ( Marks: 5 )

Write down the function of Primary-Secondary communication in line discipline.

Answer: (Page 189)

1.  Poll method works with topologies where one device is designed as a Primary station
and the other devices are Secondary stations

2.  The primary device controls the link and the secondary device follow sits instruction

3.  It is up to the primary to determine which device is allowed to use the channel at a
given time.

4.  The primary therefore is always the initiator of the a session

5.  Whenever a multipoint link consists of a primary device and multiple secondary devices
using a single TX line , all exchanges must be made through the primary device even
when the ultimate destination is a secondary device

 

 

 

 

 

FINAL TERM EXAMINATION

2010

 

Question No: 31      ( Marks: 2 )

What kind of error is undetectable by the checksum? [2]

Answer: Page 180 (repeated)

 

Question No: 32      ( Marks: 2 )

What are properties of signals?

Answer: (Page 17)

Capable of being propagated over TX. Medium ,Interpretable as data at the Receiver

 

 

Question No: 33      ( Marks: 2 )

Whether in Asynchronous or Synchronous TDM, addressing is used?

Answer: (Page 158)

Addressing is used only in Asynchronous TDM.

 

Question No: 34      ( Marks: 2 )

What is the basic purpose of Router?

Answer:           Click here for detail

Basic purpose of Router:

A router is a device that extracts the destination of a packet it receives, selects the best path to that destination, and forwards data packets to the next device along this path. They connect networks together; a LAN to a WAN for example, to access the Internet.

Question No: 35      ( Marks: 3 )

Why we need a Null Modem?

Answer:   (Page 106)

A null modem provide DTA -DTE interface w/o DCEs

Question No: 36      ( Marks: 3 )

Count LRC for the following bits?

10011010   10100101  1101 0110

Question No: 37      ( Marks: 3 )

What are the categories of multiplexing?

Answer: Page 148

There are three catogaries of  multiplxing
FDM

TDM

Have a two other catagories
Synchronous and asyrounce
WDM

Question No: 38      ( Marks: 3 )

What are the three purposes of control frames at data link layer?

Answer:   (Page 209)

Control frames serve 3 purposes:

 

 

 

 

Establishing Connections

Maintaining Flow and Error Control during Data Transmission Terminating Connection

 

Question No: 39      ( Marks: 5 )

Compare line discipline methods ENQ/ACK and Poll/ Select?

Answer:   (Page 188-189)

=>ENQ/ACK coordinates which device may start a transmission and whether or not the intended recipient is ready and enabled.

=> Using ENQ/ACK, a session can be initiated by either station on a link as long as both are of equal
rank.

=> In both half-duplex and full-duplex transmission, the initiating device establishes the session.

=> In half duplex, the initiator then sends its data while the responder waits. The responder may take over the link when the initiator is finished or has requested a response.

=> In full duplex, both devices can transmit simultaneously once the session has been established.

 

POLL/SELECT:

=> The poll/select method of line discipline works with topologies where one device is designated as a primary station and the other devices are secondary stations.

=> Multipoint systems must coordinate several nodes, not just two.

=> The primary device controls the link and the secondary device follow sits instruction

It is up to the primary to determine which device is allowed to use the channel data given time

 

 

Question No: 40      ( Marks: 5 )

What is the difference between character oriented and bit oriented protocols?

Answer: repeat

 

 

FINAL TERM EXAMINATION

2010

 

Question No: 31      ( Marks: 2 )

What are the advantages of a multipoint connection over a point-to-point connection?

Answer:

Point-to-point connection is limited to two devices, where else more than two devices share a single link in multipoint connection. Multipoint connection can be used for fail-over and reliability.

Question No: 32      ( Marks: 2 )

What’s the name of the telephone service in which there is no need of dialing.

Answer:    (Page 164)

DSS (digital data service)    is the telephone service in which there is no need of dialing.

 

Question No: 33      ( Marks: 2 )

Which type of frames is present in BSC frames?

Answer:   (Page 206)

 

 

 

 

There are two types of frames that are present in BSC.

1.  Control Frames and

2.  Data Frames

 

Question No: 34      ( Marks: 2 )

What methods of line discipline are used for peer to peer and primary secondary communication?

Answer:   (Page 187)

Line discipline is done in two ways:

1.  ENQ/ACK       (Enquiry Acknowledgement)

 

This is used for peer to peer communication.

2.  Poll/ Select

This method is used for primary secondary communication.

 

 

Question No: 35      ( Marks: 3 )

How does the checksum checker know that the received data unit is undamaged? [3]

Answer: (Page 179)

Checksum Checker or generator:

The sender subdivides data units into equal segments of ‘n’ bits(16 bits)

1.  These segments are added together using one’s complement.

2.  The total (sum) is then complemented and appended to the end of the original data unit
as redundancy bits called CHECKSUM.

3.  The extended data unit is transmitted across the network.

4.  The receiver subdivides data unit and adds all segments together and complement the
result.

5.  If the intended data unit is intact, total value found by adding the data segments and the
checksum field should be zero.

6.  If the result is not zero, the packet contains an error & the receiver rejects it.

 

Question No: 36      ( Marks: 3 )

Which one has more overhead, a repeater or a bridge? Explain your answer. [3]

Answer:

A bridge has more overhead than a repeater. A bridge processes the packet at two layers; a repeater processes a frame at only one layer. A bridge needs to search a table and find the forwarding port as well as to regenerate the signal; a repeater only regenerates the signal. In other words, a bridge is also a repeater (and more); a repeater is not a bridge.

 

 

Question No: 37      ( Marks: 3 )

Write down disadvantages of Ring Topology.

Answer:   (Page 33)

Disadvantages of Ring Topology

¾   Unidirectional Traffic

9    A break in a ring I.e. a disabled station can disable the entire network

 

 

 

 

¾   Can be solved by using:
9    Dual Ring or

9    A switch capable of closing off the Break

Question No: 38      ( Marks: 3 )

How parity bits are counted in VRC error detection method technique in case of odd parity generator?

 

Question No: 39      ( Marks: 5 )

How are lost acknowledgment and a lost frame handled at the sender site? [5]

Answer:

A lost or damaged frame is handled in the same way by the receiver; when the receiver receives a damaged frame, it discards it, which essentially means the frame is lost. The receiver remains silent about a lost frame and keeps its value of R.

Question No: 40      ( Marks: 5 )

Explain Protocol Data Unit (PDU)?

Answer:          (Page 221)

Protocol Data Unit (PDU)

The data unit in the LLC level is called the Protocol Data unit (PDU) The PDU contains 4 fields familiar from HDLC:

-A destination service access point (DSAP)
-A source service access point (SSAP)
-A control field

-An Information field

 

VU CS601 – DATA COMMUNICATION FINALTERM Solved Unsolved Past Papers SPRING 2011

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