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Code No:410454

IV B.Tech. I-Semester Supplementary Examinations, November-2003.

Time: 3 hours

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b)

Answer any FIVE questions All questions carry equal marks --Which of the OSI layers handles each of the following:(i) Dividing the transmitted bit stream into frames. (ii) Determining which route through the subnet to use. Compare and contrast OSI reference model and TCP/IP reference model.

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1.a)

COMPUTER NETWORKS (Electronics and Communication Engineering) Max. Marks: 70

Discuss the design issues for LANs. Compare fibre optics and copper wire for data transmission. What is the difference between a passive star and an active repeater in a fibre network?

3.a) b)

Compare and contrast HDLC and point to point protocols. A 12 bit Hamming Code whose hexadecimal value is arrives at a receiver. What was its original value? Assume a one bit error.

4.a)

Distinguish between Repeaters, Bridges and routes clearly bringing out their features and differences. Where and when do you use the Binary Exponential Back off algorithm? Outline the salient features of this algorithm.

b)

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2.a) b) c)

Compare and contrast “Token Bucket” and “Leaky Bucket” algorithms. Give to major differences between the warning bit method and the RED mothod.

6.a) b)

How are IP fragments reassembled at the destination? Briefly explain the Reverse Address Resolution Protocol.

7.a)

Briefly explain the salient features of the Real Time Transport Protocol. How is it different from UDP? Write a short note on the worldwide web.

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5.a) b)

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b)

8.a)

Write short notes on any three of the following: a) HTML b) Data Encryption c) Session Layer. d) DNS. -*-*-*-

Electronics and Communication

IV B.Tech. I-Semester Supplementary Examinations, November-2003. COMPUTER NETWORKS · (Electronics and Communication Engineering) · Time: 3 hours.

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