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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
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 Marks : 2
The __________ layer is the layer closest to the transmission medium.
Physical
Data Link
Network
Transport
Question No. 5 Marks : 2
The information to be communicated in a data communication system is the
___________.
Medium
Protocol
Message
Transmission
Question No. 6 Marks : 2
In ________________ transmission a timing of signal is unimportant.
Synchronous
Asynchronous
Both
None of these
Question No. 7 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 Marks : 16
Encode the given bit stream using
0 0 0 1 1 1 0 0
Question No. 9 Marks : 2
Amount of time a signal needs to complete one cycle is ____________
Frequency
Period
Phase
Bandwidth
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