COMPUTER COMMUNICATION NETWORKS (CCN), B.E. Electronics & Telecommunication, Semester 7, December 2011.

COMPUTER COMMUNICATION NETWORKS (CCN),

B.E. Electronics & Telecommunication,

Semester 7, December 2011.

Con. 6644-11

MP- 5680

(3 Hours)

[Total Mark: 100]

N.B. (1) Question No 1 is compulsory.

(2) Attempt any four questions out of remaining six questions.

(3) Figure to the right indicates full marks.

1. (a) Why does UDP exist? Would it not have been enough to just let user processes send raw IP packets? ---- (5 Marks)

(b) It was shown that flooding can be used to determine the minimum hop route. Can it be used to determine the minimum delay route? ----- (5 Marks)

(c) What do we mean we say that a bridge can filter traffic? Why is filtering Important? ---- (5 Marks)

(D) Why does the internet use a connection less network service? --- (5 Marks)

2. (a) What is ALOHA? Derive the expression for the slotted and pure ALOHA. ---- (10 Marks)

(b) What is collision and collision domain? How collision and collision domain can be reduced?
How collision can be detected? Explain CSMA/CD. ---- (10 Marks)

3. (a) What is ARQ? What are types of ARQs? Explain Go Back N ARQ In detail. ---- (10 Marks)

(b) What is HDLC? What are HDLC fame types and mode of operation? Explain in detail one mode. ---- (10 Marks)

4. (a) Write Dljkstra's Algorithm. Find shortest path (Fig 4A) to destination node 6. Will Bell Man Ford algorithms yield same solution? Why or why not? ---- (10 Marks)

(b) What is QoS? Explain various techniques to improve QoS. ----- (10 Marks)

5. (a) Explain TCP Header in details. ---- (10 Marks)

(b) What is classful lP addressing? Find maximum addresses provided by each class. --- (10 Marks)

6. (a) What is open system? Explain OSI model by drawing sender, receiver, intermediate node and Various communication between them.--- (10 Marks)

(b) Compare various switching techniques. ---- (10 Marks)

7. (a) Write a note on delay model . ---- (7 Marks)

(b) Write detail note on Leaky Bucket algorithm. ---- (7 Marks)

(c) Transmission Impairment cause and solution. ---- (6 Marks)