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Roll No. ..................................

Second-Term Examination

Sixth Semester [B.Tech] - April  2006

Paper Code : ETEC – 308 Subject : Data Communication Networks

Time : 11/2 Hours

Maximum Marks : 30

Note : Attempt any 3 questions in all. Q1 is compulsory. Each question carries 10 marks.

Q1

( a )

Can a device has more than one IP address?

1

( b )

Why is IP called best effort delivery? 1
( c ) What is MTU and how fragment is related to it? 1
( d ) What is "Silly window syndrome"? 1
( e ) Why would an application use UDP instead of TCP? 1
( f  ) What is the maximum size of TCP header? 1
( g ) Find the mask that creates 2 subnets in class B? 1
( h ) How many bits are there in IPv4 and IPv6 addresses? 1
( i ) Name any four protocols of the Application layer? 1
( j ) Encrypt the message "WONDERFUL" using monosyllabic substitution with key=4. 1

Q2

( a )

Differentiate between congestion and Quality of Service?

5

( b )

Explain Distance vector routing algorithm. How count to infinity problem is related with this algorithm>

5

Q3

( a )

Differentiate between sequence number and acknowledgement number used at the Transport layer.

5

( b )

Define sub-netting and Super-netting. Find the number of subnets and hosts/subnet for the following blocks:
Address No of subnets Hosts per subnet
122.55.66.32/20    
199.17.21.128/28    
14.22.3.0/20    
5

Q4

( a )

Explain DES? How triple DES is different from the original DES?

5

( b )

Write short notes on:
1) Token Ring
2) DQDB
 

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