LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034  M.Sc. DEGREE EXAMINATION – COMPUTER SCIENCE

AK 15

THIRD SEMESTER – NOV 2006

         CS 3808 – COMPUTER NETWORKS

 

 

Date & Time : 25-10-2006/9.00-12.00         Dept. No.                                                       Max. : 100 Marks

 

 

Part – A
Answer all the questions:	(10 x 2 = 20)

 

1. What is meant by X.25?
2. Differentiate between copper wire and fiber optics.
3. Define Parity bit.
4. What are collision free protocols?
5. Differentiate between broadcast and multicast routing.
6. What is the work of foreign agent in mobile host routing.
7. Define cryptography.
8. List the design issues of presentation layer.
9. What is meant by three-way handshake?
10. Define File management.

 

Part – B
Answer all the questions:	(5 x 8 = 40)

 

1. a) Explain the following with suitable diagrams:

1. ATM virtual circuits.
2. Broadcast links.

(Or)

1. b) Discuss any two types of Guided media with suitable diagrams.

1. a) Explain the different types of framing with examples.

(Or)

1. b) Explain Ethernet with suitable examples.

1. a) Explain Bluetooth protocol stack with a neat diagram.

(Or)

1. b) Explain Internetworking with suitable diagrams.

1. a) Explain Window management in TCP with suitable diagrams.

(Or)

1. b) Explain substitution ciphers and transposition ciphers with examples.

 

1. a) Explain Frequency dependent coding.

(Or)

1. b) Explain File servers with suitable examples.

 

Part – C
Answer any two:	(2 x 20 = 40)

 

1. a) Explain OSI Reference model with a neat diagram.

1. b) Differentiate between circuit and packet switching.

1. a) Explain link state routing with suitable example.

1. b) Explain Congestion control in Data gram subnets.

1. Explain Connection establishment and connection release in transport layer.

 

 

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