COMPUTER COMMUNICATION AND NETWORKS-OCTOBER-2011

FOURTH SEMESTER DIPLOMA EXAMINATION IN ENGINEERING/TECHNOLOGY-OCTOBER, 2011

COMPUTER COMMUNICATION AND NETWORKS

PART-A

(Maximum marks:15)

v  Answer the following questions in one or two sentences:

1.List any three characteristics of effective data communication.

2.State baud-rate.

3.Define distortion.

4.State inverse multiplexing.

5.Define Y modem.

6.State the use of control frame in BSC.

7.List the channels of ISDN.

8.State the expansion of BECN.

9.Define bridge.

10.Define Telnet.

PART-B

(Maximum marks:60)

(Answer one full question from each unit)

Unit-1

v  (a)List the categories of data communication standards.(4)

          (b)Explain in detail network topologies.(8)

OR

v  Explain ISo-OSI model with the help of a block diagram.(12)

Unit-2

v  With a neat diagram explain PCM.(12)

         

OR

v  (a)Compare serial and parallel transmission.(6)

          (b)Write a note on FSK.(6)

UNIT-3

v  (a)Write a note on bit stuffing.(6)

          (b)Write a note on data transparency.(6)

OR

v  Explain asynchronous protocols.(12)

UNIT-4

v  (a)Write a note on CSMA/CD.(6)

(b)Write a note on Gigabit Ethernet.(6)

OR

v  Write a note on Congestion avoidance.(12)

UNIT-5

v  Explain Dijkstra algorithm.(12)

OR

v  (a)Write a note on Polyalphabetic encryption.(6)

(b)Write a note on Repeaters.(6)

        

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