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ignou solved assignmeng MCS-042 Data Communication and Computer Network 2015-16

Year: 
2015

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1.
(a) Calculate channel capacity by applying Shannon’s theorem for the following parameters. Bandwidth (w) = 3100 Hz Signal to noise ratio (s/w) = 30 db
(5 Marks)
(b) Suppose a computer A sends a message to a computer D via LAN 1, Router 1 and LAN 2. Explain the processes involved and contents of the packets and frames at network layer and data link layer for each hop interface. Assume the logical and physical address on your own.
(5 Marks)
2.
(a) Given a 10 bit sequence 1001001111 and a divisor of 1011, find the CRC.
(5 Marks)
(b) How does the sampling rate affect the transmitted digital signal?
(3 Marks)
(c) What is the difference between bit rate and baud rate?
(2 Marks)
3.
(a) Explain the concept of bit stuffing. How it is different from character stuffing. If the bit string 0111101111111110111111101110 is bit staffed, what is the output string?
(4 Marks)
(b) Assume a data stream is made of 101011100. Encode this stream using the following encoding scheme:
(i) Manchester (ii) Differential Manchester Encoding (iii) R Z
(3 Marks)
(c) Construct the Hamming code for the bit sequence 10011010.
(3 Marks)
4.
(a) What are the advantages of fragmentation of frames in IEEE802.11. Discuss.
(4 Marks)
(b) Explain stop and wait ARQ. What can be the problem with this protocol?
(3 Marks)
(c) Why is sliding window protocol useful in satellite links?
(3 Marks)
6
5.
Consider the following network, with the indicated link cost. Use Dijkstra’s algorithm to find the shortest paths from source node A to all other nodes.
(10 Marks)
6.
(a) How does BGP work? How does it solve the count to infinity problem?
(5 Marks)
(b) Explain the leaky bucket algorithm.
(5 Marks)
7.
(a) Explain how does Nagle’s algorithm reduce the wastage of bandwidth.
(5 Marks)
(b) Explain TCP’s congestion control mechanism through an illustration.
(5 Marks)
8.
(a) What is the utility of digital certificate? How are these digital signatures created?
(5 Marks)
(b) Explain Diffie Hellman algorithm with the help of an example.

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Year:  2015