Himachal Pradesh University (HPU) 2009 B.Tech Computer Science and Engineering Compputer network - Question Paper

B.Tech VIIth Semester Examination, Computer Networks and Data Communication, HPU, December 2009

Note: Attempt five questions in all, selecting one from each Section A, B, C and D and all parts of Section E. All the sections carry equal marks (each question=20 marks).

Section- A

1.(a) Explain the uses of Computer Networks.
(b) Explain the function of physical and Transport layers in OSI Reference model.

2.(a) Explain the Microwave and Lightwave wireless transmission techniques.
(b) Explain ISPN system architecture with a suitable diagram.

Section- B

3.(a) Discuss the issues that need to be considered while designing a data link layer.
(b) Explain the working of Selective-Repeat sliding window mechanism with a suitable example.

4.(a) Explain how Hamming Code is useful in detecting and correcting 1-bit errors with a suitable example.
(b) Explain the function of I-frame, S-frame and U-frame in HDLC protocol.

Section- C

5.(a) Explain the working of IEEE 802.5 bases LAN.
(b) Write a short note on High Speed LANs.

6.(a) What is CSMA/CD? Explain how collisions are detected.
(b) Write a short note on Collision-free protocols.

Section- D

7.(a) What is the need for Routing? Explain shortest path routing algorithm.
(b) Explain the working of Token-Bucket algorithm.

8.(a) Write a short note on internet working.
(b) Write a short note on Transport services.

Section- E

9.Attempt all the parts:

(a) What is a Distributed System?
(b) Define the term Maximum Data Rate for a noisy channel.
(c) What is stop-and-wait protocol?
(d) What is CRC? How is it useful?
(e) Data link protocols always put the CRC in a trailer rather than in a header. Why?
(f) Define the term P-persistent CSMA?
(g) What is QOS?
(h) What is Manchester Encoding?
(i) What do you mean by Fragmentation?
(j) What is UDP? For which applications it is used?