Wednesday, December 2, 2009

IF352 – COMPUTER NETWORKS-MODEL QUESTION PAPER

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ANNA UNIVERSITY : CHENNAI – 600 025.
MODEL QUESTION PAPER
V SEMESTER
B.TECH. INFORMATION TECHNOLOGY
IF352 – COMPUTER NETWORKS

Time: 3 Hours Max. Marks: 100
Answer All Questions

PART-A ( 10 x 2 = 20 Marks)

1. What are the uses of Computer network?

2. What is the Principal difference between connectionless and connection oriented communication?

3. What is the similarity and difference between congestion control and flow control?

4. Enumerate any four reasons for using layered protocols.

5. Give the applications of Frame relay Service.

6. What are the layers and protocols used in ATM?

7. What are the requirements to connect two different networks (Ethernet and
Token ring) in the lower layers?

8. Briefly explain ALOHA and slotted ALOHA protocols.

9. Discuss the issues in transport layer.

10. Justify the need for encryption and decryption used in Data Communication

PART-B (5 x 16 = 80 Marks)

11. Explain with a neat sketch, the functions of the protocols used in each layer of the OSI model and illustrate how communication is taking place between two end systems.

12.a)i) Discuss the various types of encoding and modulation techniques used in Data communication.

ii) Explain two types of guided media and two types of unguided media transfer in networks.


OR

12.b) Explain in detail, how communication is taking place starting from connection establishment, data transfer and connection termination in

(j) Circuit switching and (ii) Packet switching.

13.a)i) Give the functions of Repeater, Switch and Hub.

ii) Why do you need routing protocols? Explain the operation of any two routing algorithms.

OR

13.b) Explain in detail, how sliding window protocol is used in HDCC for full duplex lines with window size 4.

14.a) Give the Frame Relay Protocol Architecture and explain the functions of each one.

OR

14.b)i) Explain cell delineation state diagram during Transmission of ATM Cells.

ii) Explain the requirements for ATM traffic and congestion control.

15.a)i) Define and explain the data link layer in IEEE 802 project. Why is this layer divided into sub layers?
Describe the function of each sub layer.

ii) Compare the Ethernet architecture with Token Ring.

OR

15.b) Write short notes on:

(i) FDDI (ii) E-Mail (iii) Wireless LAN (iv) ATM LAN

Click the following link to download:

http://www.ziddu.com/download/7601580/cnmodal.pdf.html

 

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Tuesday, October 13, 2009

CS 1302-COMPUTER NETWORKS-MAY/JUNE 2007

0 comments Posted by VINU at 3:56 AM

CS 1302-COMPUTER NETWORKS-MAY/JUNE 2007

PART A( 10 * 2=20marks)

1.state the purpose of layering in networks?

2.At which level of OSI model does repesters,bridges,routers and gateways operate?

3.state the different between token ring and FDDI?

4.give the structure of encoder and decoder in error coorection

5.what is meant by IP spoofing?how can be router be used to prevent IP sppofing?

6.what kind of routing information do router exchange among themselves while running

distance vector algorithm? in particular,

briefly describe the format of routing information that is exchanged?

7.briefly describe 2 advantages of using packet switching for data transmission.

8.explain how tcp flow control works.

9.why id DNS nessary?state it's significance

10.what is security parameter index?

part B(5 *16=80marks)

11.a.

(i)list four properties by which transmission media can differ(8 marks)

(ii)3 packet -switiching networks each contaion n nodes.the networks has a star

topology

with a central switch, a ring respectively and a third is fully interconnected with a wire

from every node to every other node.

what are the best,averabge and worst case transmission paths in hops?(8 marks)


OR

b

(i)describe the key elements of protocols and the standards.(8 marks)

(ii)explain in detail the data transmission in OSI reference model(8 marks)

12.a

(i)how does the 802.11 media access control protocol ensure that the receiver has a

greater chance to transmit the

acknowledgement frame before any other wireless stations grab the media?

does it always guarantee that the acknowledgment frame sent by the receiver will not

collide with another frame transmitted by another wireless station?(8 marks)

(ii)describe the collision avoidance mechanism used in 802.11 wireless LAN.

in particular,how such a mechanism solves the hidden terminal problem(8 marks)

OR

b.describe 2 approaches by which packet loss is detected in a

Go back -N ARQ protocol and seletcive repear protocol.(16 marks)

13.a.

(i)how is the looping problem solved by switches and by rou ters.

how do switches/routers handle link failure?(8 marks)

(ii)explain the IP addressing(8 marks)

OR

b.(i)compare and contrast link state and distance vector algorithma(8 marks)

(ii)in the virtual circuit network service model,before a virtual circuit is set up, the soure

router needs to specify a path

(eg. shortest path)from the source to the destination


what additional information do we need to maintain in the

routing table to support this function?

write down the resulting routing table(8 marks)

14.aif UDp does not provide any service guarantees or reliable transfer,

why can't application directly access IP and do without it?

explain UDP in details(16 marks)

OR

b.what is QOS in internetworking?state the techniques to improve QOS(16 marks)

15.a.what are the following acronym SMPT,FTP,WWW and HTTP stand for?

explain their uses and state the strengths and weakness of each of them(16 marks)

OR

b.(i)explain the role of a DNS on computer networks,

including its involvment in the process of a user accessing a web page(8 mark)

(ii)describe about symmetric -key cryptography(8 marks)

Click the following link to download:

 

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