No. of Printed Pages : 2

CS-68

BACHELOR OF COMPUTER APPLICATIONS (PRE - REVISED) Term-End Examination

cv

O

June, 2014 CS-68 : COMPUTER NETWORKS

Time : 2 hours

Maximum Marks : 60

Note : Question No.1 is compulsory. Attempt any three from the rest. 1.

(a) What is the size of ATM cell ? Write the significance of each ATM layer.

5

(b)

Show the Manchester encoding and differential Manchester encoding for the bit stream 011011101011.

4

(c)

Explain the concept of packet switching. Why circuit switching is preferred over packet switching in voice communication ?

5

(d)

Compare twisted pair and optical fiber in terms cost, bandwidth, attenuation, construction and uses.

5

(e)

Write any three functions of Data link layer and two functions of network layer of OSI model.

5

(f)

Write the importance of Hamming distance in data communication.

2

(g)

Explain TDM and FDM with the help of an example for each.

4

CS-68

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P.T.O.

2.

(a) What is count to infinity problem in distance vector routing ? Show with the help of an example. (b) Explain the advantages and disadvantages of any three topologies used in LAN.

4

6

3.

(a) Differentiate between Switches and Hubs. 4 (b) Explain the Congestion Control 6 mechanisms used at transport layer of OSI model.

4.

(a) With an infinite number of user in a slotted ALOHA channel, results show that 10% of the slots are idle. What is the channel load 'G' ? And what is the throughput ? (b) Write two applications in computer networks for which connection - oriented service is appropriate. Also, give two application for which connection-less service is best. Justify your answer.

6

(a) Compare and contrast between simplex, Half-Duplex and Full-Duplex. Also , give an example for each. (b) Assume three token ring LAN's are connected by a bridge. What happens if a fault occurs on one of the rings? What happens if a bridge fails ? Explain.

6

5.

CS-68

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CS-68 No. of Printed Pages : 2 BACHELOR OF COMPUTER ...

BACHELOR OF COMPUTER APPLICATIONS ... June, 2014. CS-68 : COMPUTER NETWORKS. Time : 2 ... (g) Explain TDM and FDM with the help of an. 4.

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