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Posted By: jegadesh Member Level: Gold Posted Date: 09 Dec 2007
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2007 Anna University B.E Computer Science CS1302 – COMPUTER NETWORKS Question paper
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B.E/B.TECG.DEGREE EXAMINATION, MAY/JUNE 2007.
Fifth semester
(Regulation 2004)
Computer Science and Engineering
CS1302 – COMPUTER NETWORKS
(Common to Information Technology)
(Common to B.C. (PartTime)
Fourth SemesteRegulation
2005)
Time: Three hours Maximum: 100 marks
Answer ALL questions
PART A –(10 ´ 2 = 20 marks)
1. State the jpurpose jof layering in networks?
2. At which level of OSI model does repeaters, bridges, routers and gateways
operate?
3. State the difference between token ring and FDDI/
4. Give the structure of encoder and decoder in error correction.
5. What is meant by IP spoofing? How can a router be used to prevent IP spoofing?
6. What kind of routing information do routers exchange among themselves while
running distance vector algorithm? In particular, briefly describe the format of the
routing information that is exchanged.
7. Briefly describe two advantages of using packet switching for data transmission.
8. Explain how TCP flow control works.
9. Why is DNS necessary? State it significance.
10. What is Security Parameter Index?
PART B – (5 ´ 16 = 80)
11. (a) (i) List four properties by which transmission media can differ. (4)
(ii) Three packet – switching networks each contain n nodes. The networks
have a star topology with a central switch, a ring respectively and a third is
fully interconnected with a wire form every node to every other node.
What are the best, average and worst case transmission paths in hops?(12)
_
Or
(b) (i) Describe the key elements of protocol and the standards. (8)
(ii) Explain in detail the data transmission in OSI reference mode.(8)
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 acknowledgement frame sent by the receiver will not
collide with another frame transmitted by another wireless station? (8)
(ii) Describe the collision avoidance mechanism used in 802.11 wireless
LAN. In particular, how such a mechanism solves the hidden terminal
problem. (8)
Or
(b) Describe two approaches by which packet loss is detected in a Go back – N
ARQ protocol and Selective Repeat Protocol. (16)
13. (a) (i) How is the looping problem solved by switches and by routers. How
do switches/routers handle link failure? (8)
(ii) Explain the IP addressing. (8)
Or
(b) (i) Compare and Contrast Link State and Distance Vector algorithms.
(ii) In the virtual circuit network service model, before a virtual circuit is set
up, the source router needs to specify a path (e.g., the 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)
14. (a) If UDP does not provide any service guarantees or reliable transfer, why can’t
applications directly access IP and do without it? Explain UDP in detail. (16)
Or
(b) What is QoS in internet working? State the techniques to improve QoS. (16)
15. (a) What are the following acronym SMTP, FTP, WWW and HTTP stand for?
Explain their uses and state the strengths and weaknesses of each of them
(16)
Or
(b) (i) Explain the role of a DNS on a computer network, incliding its
involvement in thej process of a suer accessing a web page. (8)
(ii) Describe about symmetric
key Cryptography. (8)
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