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Osmania University (OU) 2007 B.E Computer Science and Engineering Computer Networks - Question Paper

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FACULTY OF ENGINEERING

B. E. 3/4 (CSE) Ii Semester (Main) Examination, April I May 2007 Subject: Computer Networks Time: 3 Hours] * * [Max. Marks: 75

Part - A (25 Marks)

Note : Answer all questions of Part-A and answer any five questions from Part-B.

1.	Define : Broadcasting, Multicasting, Unicasting.	(3)
2.	What are choke packets ?	(2)
3.	What is initial connection protocol used for ?	(2)
4.	List out the applications of Real Time Transport Protocol.	(3)
5.	Differentiate between blocking and Non-blocking I / O.	(2)
6.	What are the different socket options ?	(3)
7.	What is the difference between caching and mirroring ?	(2)
8.	Can a machine with a single DNS name have multiple IP addresses ?
	If so, How could this occur ?	(3)
9.	What is denial of service attack ?	(2)
10.	What is PGP ? Give two reasons why PGP compresses messages. (3)

Part - B (50 Marks)

11. (a) How are Routing algorithms classified ? Explain the shortest path routing

by means of an example. (5)

(b) With a neat sketch, explain the different fields of IP Header. (5)

12. (a) What are the different Timers employed in TCP ? Discuss. (5+5) (b) Explain the TCP transmission policy.

13. (a) What is Out-of-band data ? Explain. (5+5) (b) Write a note on XTI streams.

14.(a) Differentiate between static and dynamic web documents. (6+4) (b) Suppose that you want to send an MP3 file to a friend, but your friends

ISP limits the amount of incoming mail to 1MB and the MP3 file is 4MB. Is there a way to handle this situation.

15.(a) Explain the Advanced Encryption Standard. (5+5) (b) Explain the authentication using Kerberos.

16.(a) Explain,the SMTP. (5+5)

(b) Distinguish between Digital and Streaming audio.

17. Write short notes on ftiiy two of the following : (5+5)

(a) Tunneling

(b) IPV6

(c) Digital signatures

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