Thursday, December 11, 2014

Data Communications And Networks - Question Paper of BCA 3rd Year April 2013 - Panjab University

Panjab University Chandigarh

Data Communications And Networks

Paper : BCA 3rd Year
Time : 3 Hrs.
M. Marks : 90

Note : Attempt five questions in all. select one question each from Sections A-D. Section E is compulsory.

 Section - A

1. (a) Differentiate between OSI and TCP/IP Reference models.
(b) Explain the concept of multiplexing. Discuss various types of multiplexing. 9

2. (a) Differentiate between packet switching and circuit switching. Which one is better ? 6
(b) How optical fibers are useful over twisted pair cables ? 6
(c) Discuss bus, star and ring topologies along with their advantages and disadvantages. 6

Section - B

3. (a) Discuss Hamming distance code with example.
(b) How sliding window protocols are useful in flow chart ? Discuss Go-Back-n and selective repeat with neat diagram. 9

4. (a) Discuss IEEE 802.4 standard in detail. 12
(b) Discuss design issues of data link layer. 6

Section - C

5. (a) Discuss various characteristics of Routing Algorithm. Also discuss optimality principles. 9
(b) Discuss how leaky bucket algorithm is useful in controlling the congestion. 9

6. (a) Discuss reverse path forwarding technique of broadcast routing in detail. 9
(b) Discuss the concept of flooding. How flooding is useful over other routing techniques ? 9

Section - D

7. (a) What is Cryptography ? Discuss substitution ciphers and transposition ciphers in detail with example. 8
(b) Discuss audio comperssion in detail. 8

8. (a) Discuss the architecture of World Wide Web. 8
(b) Discuss Remote Login and File Transfer in detail. 10

Section - E

9. (a) What is ISDN ? Discuss in brief. 3
(b) Discuss the concept of modulation ? 3
(c) Discuss dynamic channel allocation in brief. 3
(d) Differentiate between Flow Control and Congestion Control. 3
(e) Discuss the components of an E-mail system. 3
(f) Discuss the concept behind token bus standard. 3
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