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Code No. 420355 IV-B.Tech- II Semester Supplementary Examinations July 2003 COMPUTER COMMUNICATIONS (Mechanical Engineering)

Max. Marks: 70 Answer any Five questions All questions carry equal marks ---

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Time: 3 hours

Describe various data communication types? Explain serial and parallel transmission modes with their merits and demerits?

2. a) b)

Explain, RS-232 inter face? Explain properties of satellite and fiber optics communication techniques?

3. a) b)

Explain CSMA/CD techniques? Describe error detection techniques?

4.

Explain HDLC frame format and its protocols?

5. a) b)

Describe circuit switching and packet switching techniques? Compare connection oriented and connection less services?

6.

Describe ISO-OSI seven layer architecture? Describe the goals and functions of each layer?

7.

Describe sliding window protocols?

8.

Write short notes on the following? a) Gateways b) TCP/IP architecture

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c) E-mail services.

II Semester Supplementary Examinations July 2003 COMPUTER ...

5. a) Describe circuit switching and packet switching techniques? b) Compare connection oriented and connection less services? 6. Describe ISO-OSI seven ...

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