Jawaharlal Nehru Technological University Hyderabad 2005-2nd Sem B.E Computer Science COMPUTER NETWORKS III B.TechSupplementary s, emr/emr - Question Paper

III B.Tech II Semester Supplementary Examinations,
November/December 2005
COMPUTER NETWORKS
( Common to Computer Science & Engineering, info Technology
and Electronics & Computer Engineering)
Time: three hours Max Marks: 80
ans any 5 ques.
All ques. carry equal marks
? ? ? ? ?
1. (a) With a neat diagram, discuss the functionality of layers, protocols and inter-
faces. [10]
(b) What is the difference ranging from connection-oriented and connectionless switch-
ing. [6]
2. (a) Differentiate B-ISDN ATM reference model with OSI reference model. [6]
(b) discuss the ISDN interfaces. [10]
3. (a) explain the design problems of data link layer? [8]
(b) discuss sliding window protocol ? [8]
4. (a) elaborate bridges? What key factors are considered while designing the
bridges. [8]
(b) discuss the operation of Transparent bridge. [8]
5. (a) Differentiate ranging from transmission path, virtual path and virtual circuit. [6]
(b) discuss link state routing with an example. [10]
6. (a) Compare virtual circuit and datagram subnets. [5]
(b) discuss the concept CIDR. [5]
(c) explain about ATM LAN emulation. [6]
7. (a) Differentiate virtual circuit and datagram services with respect to transport
layer. [6]
(b) explain End-to-End service and datagrams. [5]
(c) Write a note on achieving reliability with reference to network communication.
[5]
8. (a) What is meant by authentication? discuss how authentication based on
shared secret key works? [8]
(b) discuss how Diffie-Hellman Key exchange protocol works? [8]

Earning:   Approval pending.