COMPUTER COMMUNICATION AND NETWORKS-OCTOBER-2009

FOURTH  SEMESTER DIPLOMA EXAMINATION IN ENGINEERING/TECHNOLOGY-OCTOBER, 2009

COMPUTER COMMUNICATION AND NETWORKS

PART-A

(Maximum marks:15)

v  Answer the following questions in one or two sentences:

1.Define a protocol.

2.Define data rate.

3.Define modem.

4.Define signal element.

5.Define burst error.

6.Define bit stuffing.

7.What is CSMA/CD?

8.Define baseband transmission.

9.Define cipher.

10.Define client process.

PART-B

(Maximum marks:60)

(Answer one full question from each unit)

Unit-1

v  (a)Define a data communication model.(6)

          (b)Write a note on LANs.(6)

OR

v  Explain ISO-OSI model with the help of a block diagram and state the functions of each layer.(12)

Unit-2

v  With neat diagrams write a note on different shift keying techniques.(12)

         

OR

v  Write a note on FDM with suitable diagrams.(12)

UNIT-3

v Explain flag fields,address fields,control field and information field of  an HDLC frame.(12)

OR

v  (a)Write a note on go-back-in ARQ.(6)

          (b)Write a note on bit oriented protocols.(6)

UNIT-4

v  (a)Write a note on Fast Ethernet.(6)

(b)Write a note CSMA/CD system.(6)

OR

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

          (b)Write a note on IEEE 802.4 standard,Token Bus.(6)

UNIT-5

v  Write a note on distance vector routing.(12)

OR

v  Write a note on POP and IMAP.(12)

        

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