No. of Printed Pages : 2

I MCS-042

MCA (Revised) Term-End Examination December, 2015 MCS-042 : DATA COMMUNICATION AND COMPUTER NETWORKS Time : 3 hours

Maximum Marks : 100

Note : Question no. 1 is compulsory. Attempt any three questions from the rest. 1. (a) Consider the following network with the indicated link cost. Use Dijkstra's shortest path algorithm to compute the shortest path from source node 1 to the network node 5.

(b) (c)

MCS-042

Explain the RSA algorithm using an example. What are the functions of Data Link Layer ? How is error correction carried out at this layer ? 1

10

10

10

P.T.O.

(d) (e)

2.

(a)

and

detection congestion Illustrate congestion avoidance phases in TCP.

5

Why are RTS and CTS used in IEEE 802.11 protocol ?

5

What is the purpose of PCM ? Explain the different components of PCM encoder. How

10

are quantization levels chosen in PCM ? (b)

Why is sliding window protocol useful in satellite links ? Illustrate GO-BACK-N and

3.

(a) (b)

4.

(a)

(b)

5.

(a) (b)

MCS-042

SELECTIVE REPEAT protocols.

10

How does token bucket traffic shaper work ? Explain with the help of a diagram.

10

Discuss the addressing classes in IP. Why is subnet masking used in IP addressing ?

10

Derive an expression for throughput in Slotted Aloha. Why is this system unstable ?

10

What is Nagle's algorithm ? How does it reduce the wastage of bandwidth ?

10

Why is fragmentation Illustrate OSPF.

used

in

IP

?

10

How is connection established in TCP ? Illustrate multiplexing in TCP.

2

10

10,000

2) MCS-042

COMPUTER NETWORKS. Time : 3 hours ... (a) Consider the following network with the indicated link cost. ... Explain with the help of a diagram. 10. (b) Discuss ...

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