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BACHELOR IN COMPUTER APPLICATIONS Term-End F-xamination

CS-68 : GOMPUTER NETWORKS T'ime : 3 hours Note

1'

Maximu,mMa.rks: 75

3

Quesfion number I fs compulsory. Ansu er any three questionsfrom the rest.

(a)

What.do you mean by Data Communication? Write the characteristicson which elfectivenessof data communicationsystemdepends.

(b)

Define point to point network and explain any three topologiesfor point to point subnet

(c)

Explain different categoriesof network that is IAN, WAN and MAN. Also write one protocol name used for each type of network.

(d)

Define different sublayersof Data Link Layer. Also write the servicesprovided by Data Link Layer.

5

(e)

Name different LAN architectures.

2

(f)

Explain Stop and wait protocol with the help of a suitablediagram.

CS-68

a

P.T,O.


2.

(a)

Differentiate between Hub and Switch

(b)

Explain the function of a modem. What are the modulation techniques used in modems ?

(c)

Explain five different traffic control mechanisms in networks.

t-

(a) Enlist the differences between Virtual circuit and DatagramSubnet. Discuss the need of multiplexing. Also explain upward and downward multiplexingwith diagram.

5

(c)

Why does congestionoccur in data networks ?

4

(a)

Explain the processhow ATM protocol works.

5

(b)

Write the advantagesof small and fixed sizecells.

4

(c)

Define Data rate and signal rate. An analog signal carries4 bits per signal.If 1000 signalselementsare sent per sec, Iind the bit rate.

(a)

Explain Ethernetprotocol.

(b)

Explain the charbcteristicsof Broadband Coaxial

(b)

4.

5.

I

(c)

CS-68

Cable.

5

Explain the advantagesof ISDN.

5

10,000


Cs 68 dec 07