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M.E/M.Tech DEGREE EXAMINATION, JUNE 2010

First Semester

Cm!"ter Scie#ce $#% E#&i#eeri#&

CS'21( ) COM*UTER NET+ORS AND MANAGEMENT

-Cmm# t M.E. St$re E#&i#eeri#& $#% M.Tech I#rm$ti# Tech#&3

-Re&"$ti# 200'3

Time4 Three h"rs M$5im"m4 100 M$r6s

A#ser $ the 7"esti#s

*$rt A ) -10 5 2 8 20 M$r6s3

1. How does ATM achieve high speed switching?

2. What is the principle of binary exponential back off techni!e? What is its p!rpose?". #n a packet switching network$ 2% packets arrive at a partic!lar node in an ho!r on

average. There are typically & packets in the node. What is the average ti'e spent by the

packet in the node?

%. What is the need for explicit and i'plicit signaling 'echanis's in fra'e relay congestion

control?

(. Mention any two advantages of token b!cket traffic specification.

). Mention any one advantage and disadvantage of fair !e!ing.*. +erive an expression for the thro!ghp!t of T,- sliding window flow control sche'e$

ignoring T,- overhead.&. What are the obectives of ATM layer traffic and congestion control?

/. What is the principle of M-0 traffic engineering?1. Why is T,-$ not s!itable for real ti'e distrib!ted applications?

*$rt 9 ) -: 5 1; 8

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the average ti'e spent in the switch and the average n!'ber of 'essages in the switch$

when 'essages arrive at an average rate of

8ne per ('s and

8ne per ) 's -