2007 Jawaharlal Nehru Technological University B.E III B.Tech II Semester Regular Examinations, Apr/May 2007 COMPUTER NETWORKS ( Common to Computer Science & Engineering, Information Technology, Electronics & Control Engineering, Computer Science & Systems Engineering and Electronics & Computer Engine Question paper

Course: B.E Computer Science

University: Jawaharlal Nehru Technological University

Code No: RR320503 Set No. 1
III B.Tech II Semester Regular Examinations, Apr/May 2007
COMPUTER NETWORKS
( Common to Computer Science & Engineering, Information Technology,
Electronics & Control Engineering, Computer Science & Systems
Engineering and Electronics & Computer Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. (a) Write any four reasons for using layered protocols.
(b) List two ways in which the OSI reference model and the TCP/IP reference
model are the same and list in which they dier.
(c) Which is the principle dierence between CO communication and CL commu-
nication. [6+4+6]

2. (a) Mentioning the advantages and disadvantages, explain sliding window protocol
using Go back n and using selective repeat.
(b) Draw, and explain about HDLC protocol. [8+8]

3. (a) Explain in detail the operation of slotted ALOHA.
(b) Consider the delay of pure ALOHA versus slotted ALOHA at low load. Which
one is less? Explain your answer. [8+8]

4. (a) An ATM network uses a token bucket scheme for trac shaping. A new token
is put into the bucket every 5 µsec. What is the maximum sustainable net
data rate (i.e., excluding header bits)?
(b) A computer on a 6-Mbps network is regulated by a token bucket. The token
bucket is filled at a rate of 1Mbps. It is initially filled to capacity with 8
megabits. How long can the computer transmit at the full 6 Mbps?
(c) A data gram subnet allows routers to drop packets whenever they need to. The
probability of a router discarding a packet is p. Consider the case of a source
host connected to the source router, which is connected to the destination
router, and then to the destination host. If either of the routers discards a
packet, the source host eventually times out and tries again. If the host-router
and router-router lines are counted as hops, what is the mean number of
i. hops a packet makes per transmission?
ii. transmissions a packet makes?
iii. hops required per received packet? [4+6+6]

5. (a) Imagine that a two-way handshake rather than a three-way handshake were
used to set up connections. In other words, the third message was not required.
Are deadlocks now possible? Give an example or show that none exist.
(b) Explain in detail Four protocol scenarios for releasing a connection. [8+8]

6. (a) Briefly discuss about the ways network can dier.
(b) Briefly discuss about IP address classes and special IP addresses. [8+8]

7. (a) What is Nagle’s algorithm? Explain the problem of silly window syndrome:
suggest a solution to this problem.
(b) Briefly discuss about TCP timer management. [8+8]

8. (a) What is Cryptanalysis? Briefly discuss about substitution cipher, transposi-
tion ciphers and one-time pads.
(b) Explain any one secrete key algorithm.[8+8]

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