Andhra University 2005-1st Year B.Tech Computer Science and Engineering Forth Semester - COMPUTER NETWORKS - Question Paper

MODEL PAPER

B. Tech (CSE) Degree exam

Forth Year - 1st Semester

COMPUTER NETWORKS

Time: three hrs
Max Marks: 70

First ques. is Compulsory

ans any 4 from the remaining ques.

All ques. carry equal marks

ans all parts of any ques. at 1 place

1 .a) Write the 3 phases of Circuit Switching.
b) What is a Datagram?
c) elaborate the ATM Service categories?
d) What do you understand by Random Routing?
e) elaborate the functions of a Bridge?
f) List the requirements for an an Internetworking facility
g) What does UDP give that is not given by IP

2.a) Distinguish among Circuit switching. Packet switching and Virtual Circuit Packet Switching Techniques.
b) elaborate the relative merits and demerits of Frame relay compared to X25.

3. a) List and briefly discuss the fields in an ATM cell.
b) obtain the lowest cost path using Dijkstra’s algorithm for the packet switching network shown beneath with link costs.
-----DIAGRAM-----

4. a) Write the effects of congestion in data networks. Briefly discuss the congestion control
b) Briefly discuss the operation of Cellular Systems.

5. a) List 4 common LAN topologies and briefly define their methods of operation.
b) Distinguish among the subsequent with respect to their characteristics.


10BASE5 10BASE2 10BASE-T 10BASE-FP
6. a) discuss the function of the 3 flags in the IPv4 header. How is the IPv4 header checksum calculated?
b) Using a neat sketch, discuss the Internet protocol operation with brief design problems.

7. a) What is meant by multicasting? provide the requirements for multicasting.
b) Write the addressing elements needed to specifr a target transport service (IS) user. define 4 strategies by which a sending TS user can learn the address of a receiving TS user.

8. Write short notes on the following:
a) HTTP b) TCP Mechanisms
c) Difference ranging from HUB and Layer2 Switch d) Wireless LAN

Earning:   Approval pending.