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SATHYABAMA UNIVERSITY

(Established under section 3 of UGC Act,1956)


Course & Branch :B.E
-

ECE

Title of the Paper :Computer Communication


Max. Marks:80

Sub. Code :613702(2007
-
08)






Time : 3 Hours

Date :24/08/2012








Session :FN

_____________________________________________________________________________________________________________________________
__



PART
-

A (10 x 2 = 20)


Answer ALL the Questions

1.

Define computer networks


2.

Define bandwidth of communication medium?


3.

C
ompare pure aloha and controlled aloha.


4.

What are the design issues for packet radio networks?


5.

What is the role of intern
etworking devices in computer
networks?


6.

List the advantages of virtual circuit network?


7.

What you mean by priority queuing?


8.

What is the use of queuing theory in computer network?


9.

What is virtual terminal?


10.

Give the basic principle used i
n data compression system.


PART


B



(5 x 12 = 60)

Answer ALL the Questions


11.

Describe the ISO reference model layers
.

(or)

12.

What is computer network architecture? Explain any three
architecture
.



13.

Describe CSMA/CD LAN protocol and
architecture
.

(or)

14.

What is the use of sliding window protocol? Describe the
working principle
.


15.

How congestion control is done in datagram networks? Explain
any two algorithms for that
.

(or)

16.

Explain how routing is done in distance vector routin
g with a
help of example sub

net
.


17.

Explain the M/G/I queuing model
.

(or)

18.

Write short notes:


(a)

Dynamic buffer and block storage.


(b)

Multi
-
user queues


19.

Write a short note on
(a
) cryptography
(b
) remote procedure call.

(or)

20.

Write a short note on
(a
) FTAM
(b
)E
-
mail.