JU – 874

*JU874*

VII Semester B.E. (E & C) Degree Examination, January/February 2014 (2K6) EC 703 : COMPUTER COMMUNICATION NETWORKS Time : 3 Hours

Max. Marks : 100

Instructions : i) Answer any five full questions selecting at least two questions from each Part. ii) Missing data may be assumed suitably. PART – A 1. a) With suitable diagram briefly explain all the layers in the ISO-OSI network model.

10

b) What is Internet ? Define the following terms as applied to the internet : i) Network Protocol ii) Internet Backbones iii) RFC iv) End Systems, Clients and Servers.

10

2. a) With the help of segment structure explain as to how TCP implements a reliable data transfer service in the Internet. 10 b) Explain HTTP. 3. a) What is Routing ? Explain Link State Routing. b) Explain the format of the IPV6 datagram.

10 10 10

4. a) Compare and contrast the following switched networks : i) Circuit – Switched ii) Packet – Switched iii) Message – Switched. b) With the help of a flow diagram explain the CSMA/CD protocol.

10 10 P.T.O.

*JU874*

JU – 874 PART – B

5. a) Illustrate the Go-Back-N ARQ protocol which is used to improve the efficiency of transmission. 10 b) What is TCP congestion ? Explain the following components of TCP congestion control algorithm : i) Additive – increase, Multiplicative – decrease ii) Slow Start.

10

6. a) What is Traffic Shaping in a network ? Explain ‘Leaky Bucket’ technique. b) Explain the router model in the integrated services IP. What are the two services provided by intserv model ? 7. a) Describe the 802.11 frame format in detail.

10 10 10

b) Define security, service attacks and mechanism. Describe the classification of security services and attacks. 10 8. Write short notes on : i) Routers and Bridges ii) Frame format of RTP iii) Public Key Encryption iv) RSVP

20

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