# Education In Pakistan

## VU CS601- DATA COMMUNICATION MID TERM EXAMINATION SEMESTER Fall 2004

Name

PVC Name/Code

Date

Question Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q8 Q9 Total

Marks

.

MID TERM EXAMINATION

SEMESTER Fall 2004

CS601- DATA COMMUNICATION

Total Marks:50

Duration:60min

Maximum Time Allowed: (1 Hour)

1. The duration of this examination is 60 minutes.

2. This examination is closed book, closed notes, closed neighbors.

4. Do not ask any questions about the contents of this examination from anyone.

a. If you think that there is something wrong with any of the questions, attempt it to

b. If you believe that some essential piece of information is missing, make an

appropriate assumption and use it to solve the problem.

**WARNING: Please note that Virtual University takes serious note of unfair means.

Anyone found involved in cheating will get an `F` grade in this course.

For Teacherâ€™s use only

Question No: 1

What is the difference between active and passive hubs?

Marks:5

Question No: 2 Marks:5

Which particular layer of OSI model is not required, if two devices communicate at the same network?

Question No: 3 Marks:5

A sine wave is offset (amount of wave shift) 1/6 of a cycle with respect to time zero. What is its phase in

degrees?

Question No: 4 Marks:8

Which particular scheme is used in the following figure for digital to digital conversion? Explain you

Value

1 0 0 1 1 1 0

Time

Question No: 5 Marks:5

Which of the following determines the bandwidth required to send the signal?

1) Bit rate

2) Baud rate

Explain with example.

Question No: 6 Marks:7

A constellation diagram consists of eight equally spaced points on a circle. If bit rate is 4800 bps, what is the Baud

Rate?

Question No: 7 Marks:5

How noise effect on ASK? What do you know about On-Off Keying (OOK) technique?

Question No: 8 Marks: 5

Differentiate between the terms Full Duplex and Half Duplex?

Question No: 9 Marks: 5

What do you know about DTE and DCE?