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B.E/B.Tech. DEGREE EXAMINATION, NOVEMBER/DECEMBER 2012
Fifth Semester
Information Technology
080250021- COMPUTER NETWORKS
(Regulation 2010)
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PART A-(10*2=20 marks)
1. What are the components of a network?
2.Why are modems needed for telephone communication?
3. What is the mechanism of stop-and-wait flow control?
4. What is FDDI?
5. Define packet switching.
6. What is the purpose of subnetting?
7. What are sockets?
8. List the various network-oriented QoS attributes.
9. Why SMPT is needed?
10. What is character level encryption? Give some example.
PART B-(5*16=80 marks)
11. (a) (i) Describe the ISO/OSI network model with neat diagram. (12)
(ii) Compare LAN and WAN. (4)
(or)
(b) (i) Explain the various guided transmission media. (10)
(ii) Discuss about categories of networks. (6)
12. (a) (i) Explain how CRC helps in erroe detection and correction. (10)
(ii) What is SONET? Explain.
(or)
(b) (i) Explain in detail about HDLC. (10)
(ii) Differentiate go back N and selective repeat. (6)
13. (a) Explain about the IP addressing methods. (16)
(or)
(b) Describe in detail the distance vector routing. (16)
14. (a) (i) Explain in detail User Datagram Protocol (UDP) (6)
(ii) Briefly explain about integrated services. (10)
(or)
(b) Explain in detail Transmission Control Protocol, header and functionality.(16)
15. (a) Discuss about the following:
(i) Domain Name System. (8)
(ii) File Transfer Protocol. (8)
(or)
(b) (i) Explain in detail about WWW. (10)
(ii) Explain various attacks on data? How are they resolved? (6) )
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