N A L A N D A O P E N U N I V E R S I T Y
Master of Computer Application Part-I
PAPER-IX
(Data Communication and Computer Networks)
Annual Examination, 2016
Time 3 Hours. Full Marks 80
Answer any Five Questions.
All questions carry equal marks.
1. Differentiate between 'Client/Server' and `Peer to Peer' architecture. Draw the diagrams for
both the architectures.
2. What is the purpose of PCM? Explain the different components of PCM encoder. How are
quantization levels chosen in PCM?
3. Describe the protocols of Data Link Layer. Data link protocol almost always puts CRC in trailer
rather than in a header. Why?
4. Explain token bucket algorithm and compare its performance against the leaky bucket
algorithm. Describe the layer of OSI model which is responsible for these algorithms.
5. Explain the operation of congestion control algorithm in TCP and the operation of Reverse
path forwarding algorithm.
6. Discuss how the message is transmitted in telephone networks. Compare and contrast circuit
switching, packet switching and message switching.
7. Explain the difference between OSI model and TCP/IP model by comparing each layers of
both the models.
8. Discuss the process of link state routing. Explain how it overcomes the problem of Count-toinfinity
for distance vector routing.
9. Illustrate congestion detection and congestion avoidance phases in TCP. Draw TCP Header
format and explain the use of TCP header fields.
10. Write short notes on the following
Class in IP
Nagle's algorithm
IEEE 802.11
OSPF