COMPUTER COMMUNICATION NETWORKS (CCN), B.E. Electronics & Telecommunication, Semester 7, May 2010.

COMPUTER COMMUNICATION NETWORKS (CCN),

B.E. Electronics & Telecommunication,

Semester 7, May 2010.

Con. 3187-10

AN- 3235

(REVISED COURSE)

(3 Hours)

[Total Mark: 100]

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

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

1. (a) What is data transparency ? Explain bit stuffing and destuffing. ---- (5 Marks)

(b) What tasks are performed by the transport layer? ---- (5 Marks)

(c) Explain different network components. ---- (5 Marks)

(d) What is fixed routing? What are the advantages and disadvantages of adaptive routing? ---- (5 Marks)

2. (a) What is flow control? Explain stop and wait ARQ protocol. --- (10 Marks)

(b) With suitable sketches explain the working of sliding window flowcontrol mechanism. ---- (10 Marks)

3. (a) Describe station types, configuration and modes of communication (response modes) supported by HDLC protocol. ---- (10 Marks)

(b) Explain HDLC frame format. --- (10 Marks)

4. (a) Explain the meaning of various fields in the TCP header frame format. ---- (10 Marks)

(b) Explain following medium sharing scheduling techniques: --- (10 Marks)

(i) Reservation

(ii) Polling

(iii) Token passing

5. (a) Compare circuit switching, datagram packet switching and virtual packet switching techniques with the help of timing diagram. ---- (10 Marks)

(b) Explain the meaning of various fields in the IP header frame format. ---- (10 Marks)

6. (a) How does ATM differ from frame relay? What are the relative advantages and disadvantages of ATM compare to frame relay? ----- (10 Marks)

(b) What is the essential difference between Dijkstra algorithm and Bellman – Ford algorithm? Explain these algorithms in brief. ---- (10 Marks)

7. Write short notes on any two of the following: ---- (20 Marks)

(a) IEEE project 802

(b) SONET and SDH

(c) CSMA/CA procedure.