Code No: 410454 IV B.Tech. I-Semester Supplementary Examinations, November-2004

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COMPUTER NETWORKS (Electronics and Communications Engineering) Time: 3 hours Max Marks: 70 Answer any FIVE Questions All Questions carry equal marks --1.a) Describe TCP/IP model? b) Describe Hierarchical and LAN designs?

Describe selective repeat protocol? What will be the Transmitted message for the message 110001101101 using G(x) or polynomial x7 + x5 + 1.

3.a) b)

Describe CSMA and collision free protocols? Compare 802.3, 802.4 and 802.5?

4.a) b)

Describe about Bridges? Describe any two congestion algorithms?

5.

Describe the network layer in the internet? Give its format and explain each field and also explain the addressing classes available on the internet?

6.a) b)

Describe how Transport layer establishes and releases the connection? Describe about flow control and buffering schemes?

7.a) b)

Describe about Authentication and Digital signatures that were used in Networks. Describe public key cryptographic algorithm?

8.

Write short notes on any three of the following: a) SNMP b) World wide web c) Transmission media d) ARPANET.

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2.a) b)

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