Dr.A.P.J.Abdul Kalam University BE VII SEM ALL BRANCH Computer Networks [EC705] Dec - 2020 Question Paper

Dr.A.P.J.Abdul Kalam University

Bachelor of Engineering

Seventh Semester Main Examination, Dec-2020

Computer Networks [EC705]

Branch: EC

Time: 3:00 Hrs Max Marks 70

Note : 1. Attempt any five questions out of eight.

2. All questions carry equal marks.

Q.1 (a) Write any two difference between connection oriented and connectionless service?

(b) What is computer network and how it is different from distributed system.

Q.2 (a) State the 7 layers of the OSI model in the correct order and briefly describe the function of

each layer

(b) Explain sliding window protocol? Define Go-back N protocol in detail?

Q.3 (a) What is difference between Slotted ALOHA and pure ALOHA?

 (b) How does CSMA/CD differ from CSMA/CA?

Q.4 (a) What are the functions performed by data link layer? Discus flow and error control protocols

in Data Link Layer.

 (b) Explain the design issues of network layer.

Q.5 (a) Explain the following protocol:

 (i) SDLC (ii) LAP & LAPB

 (b) How adaptive tree walk protocol works?

Q.6 (a) Explain the mechanism of stop and wait ARQ?

(b) Explain IPv4 Header Format with neat sketch and difference between IPv4 and IPv6

Protocol.

Q.7 (a) What are the advantages of Internet TCP/IP model over OSI model?

 (b) Explain the difference between TCP and UDP protocols.

Q.8 (a) Write a short note on:

 (i) HTTP (ii) DNS (iii) FTP

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