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P1275

Total No. of Questions: 12] [Total No. of Pages : 3 .

. [3164]-454

B.E. (E&T.C)COMPUTER NETWORKS

(404214) (2003 Course)

[Max. Marks: 100Time: 3 Hours]

Instructions:,

Answer any three questionsfrom each section.

Answers to the two sections should be written in separate books.

Neat diagrams mustbe drawn wherever:.necessary.

......;w

Ql) a)

'--'Q2) a)

,

1)

2)

3)

4)

5)

Figures to the right indicate full marks.

Use of logarit!tmic tables, slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed.

Assume suitable data, if necessary.6)

SECTION - I

b)

c)

Draw and explain ISO-OSI reference Model? Explain drawbacks of ISO-OSI reference Model. . [8]

Compare peer to peer networks and client-server networks. [4]

What is 802.11? Explain Wireless LAN in brief. [4]

OR

b)

Explain different Service primitives. Compare connection orientedservice and Connectionless service. [8] .

Explain briefly [4]

i) Host

ii) Subnetiii) Broadcast network

iv) Point to Point Network.

Draw computer network with extended star topology. Explain brieflythe steps. required to establish the network between two standalone

computers. [4]

c)

P.T.D.

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Q3) a)

b)

What is the practical bit rate supported by telephone line? List the

different unguided media and explain briefly anyone of them. [8]

Draw and explain functional b~ock diagram of modem. Classify the

different protocols used in modem and explain briefly anyone of them.

[8]OR

Q4) a) Compare following.

. . i) Circuit switching and Packet switching network

ii) Compare LEO Vs MEO Vs GEO.

b) Draw and explain typical cable TV system. How cable video signaland Internet data can be send over the same cable. [8]

Q5) a)

Q6) a)

Q7) a)

[3164]-454

[8]

b)

List the different framing. methods and explain anyone of them in

detail. [6]

Explain briefly CSMA/CD by taking four nodes as AI, A2, A3 a~dA4. Also explain bit map protoool briefly.' [6]

Consider the use of 1000 bit frames on a 1 Mbps satellite channel.What is the maximum Links utilization for

i) Stop and wait ARQ.

ii) Continuous ARQ with Window size 7.

iii) Continuous ARQ with Window size 127.

c)

[6]

OR

b)

c)

Explain the following:

i) 1 Persistent CSMA.

ii) Non-Persistent CSMA.

iii) P-Persistent CSMA.

Compare 802.4 and 802.5 technology. [6]

A channel has bit rate, of 5.7 kbps and propagation delay is 12 msec.

For what range of frame size does stoP. and wait technique gives an

efficiency of 40%? [6]

'~

[6]

SECTION - II

b)

c)

How congestion affects network performance. Also explain the

difference between flow control and congestion control. [8]

Explain the Link state routing and its features. [4]

Compare virtual circuit and datagram networks. [4]

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Q8) a)

Q9) a)

QI0) a)

~ b)

~

[3164]-454

b)

OR

Explain the different QoS parameters. Also write about transport service

primitives. . [8]

Explain connection establishment and connection termination with

respect to the transport layer. . [4]

Explain token Bucket algorithm briefly. [4]c)

Explain substitution cipher and Transposition cipher technique in detail., [8]

b) How electronic mail system work? What is the role of SMTP server in

this E-mail System? [8]

OR

Write a short note on "Video on Demand". [8]

What is Socket? What is Socket address? What will be the socket addressof machine having IP address = 192.168.3.101 in case of web server

(http) and FTP server installed on the same machine. . [8]

Explain "X" Windows system in TCP/IP. J. [6]

Explain Telnet server and Telnet client communication. Can you use

Telnet for LAN as well as Int~rnet? [6]

Compare TCP and UDP. [6]

OR

Explain the concept of subnetting and advantages of subnetting. [6]

Explain Traceroute utility with respect to TCP/IP. . [6]

Explain the ARP and RARP protocols operation in your LAN. [6]'

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- 3 -

Ql1)a)

b)--

c)- .

.Q12) a)

b)

c)

"'-"

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