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Posts Tagged ‘VU. CS601. Data. Communication. Mid Term. Examination – .Spring .2006’

VU CS601 Data Communication Mid Term Examination – Spring 2006

.

CS601 Data Communication

Mid Term Examination – Spring 2006

Time Allowed: 90 Minutes

Please read the following instructions carefully before attempting any

question:

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

2. Answer all questions.

a. There is no choice.

b. You will have to answer correctly all questions in this

examination to get the maximum possible marks.

3. 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 the best of your understanding.

b. If you believe that some essential piece of information is

missing, make an appropriate assumption and use it to solve

the problem.

4. Choose only one choice as your answer in the multiple choice

questions.

a. If you believe that two (or more) of the choices are the correct

ones for a particular question, choose the best one.

b. On the other hand, if you believe that all of the choices

provided for a particular question are the wrong ones, select

the one that appears to you as being the least wrong.

**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.

Question No. 1

Marks : 2

Which of the following is most affected by voice?

QAM

ASK

FSK

PSK

Question No. 2

Marks : 14

One of the disadvantages of using point to point (Mesh) network is that the number of

connections grows more rapidly as the number of computers increase. Find the number

of connections needed to be used in point to point (Mesh) topology in network of 10 and

than 40 computers. Also find that how many I/O ports are needed for each device in both

cases. Also write formulas used to solve this question?

Question No. 3

Marks : 10

Write details of the following functions of data link layer with respect to OSI model.

a) Physical Addressing.

b) Access Control.

Question No. 4

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

Physical

Data Link

Network

Transport

Question No. 5

The information to be communicated in a data communication system is the

___________.

Marks : 2

Marks : 2

Medium

Protocol

Message

Transmission

Question No. 6

In ________________ transmission a timing of signal is unimportant.

Synchronous

Asynchronous

Both

None of these

Question No. 7

Marks : 2

Marks : 10

We want to digitize the human voice. What is the bit rate, assuming 8 bits per sample?

Also write formulas used to solve this question.

Question No. 8

Encode the given bit stream using Manchester encoding scheme.

0 0 0 1 1 1 0 0

Question No. 9

Amount of time a signal needs to complete one cycle is ____________

Frequency

Period

Phase

Bandwidth

Marks : 16

Marks : 2

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