GTU Computer Network - December 2014 Exam Question Paper

GTU Computer Engineering (Semester 5)
Computer Network
December 2014

Total marks: --
Total time: --

INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

1 (a) Draw diagram of OSI reference model? What are the benefits of layering approach in OSI model?

7 M

1 (b) Give differences between
1. Connection oriented versus Connection less services.
2. Flow Control versus Congestion control.

7 M

2 (a) Write a note on guided and un-guided transmission medium.

7 M

2 (b) Enlist various framing techniques used in data link layer. Explain any one in detail with suitable example.

7 M

2 (c) Explain the usage of following devices. Also discuss the OSI layer at which they are used.
1. Bridge
2. Repeater
3. Hub and Switch
4. Router
5. Gateway

7 M

3 (a) What is ALOHA? Explain variants of ALOHA protocol.

7 M

3 (b) What is the difference between error detection and correction? Explain any one error correction technique with suitable example.

7 M

3 (c) Explain CSMA and CSMA/CD protocols.

7 M

3 (d) (i) Write and explain statement of Optimality Principle with example.

3 M

3 (d) (ii) Explain the word jitter control with suitable example.

4 M

4 (a) Explain following with respect to IP address. Also give proper examples of each.
1. Structure of IPv4 address
2. Subnet mask
3. Default gateway

7 M

4 (b) Explain shortest path routing protocol with suitable example.

7 M

4 (c) What is subnet? Explain various classes of IPv4 address with respect to bits reserved for host_id and net_id. Give example and ranges of each class of IPv4 address

7 M

4 (d) What is congestion? What are the reasons behind congestion? Explain choke packet mechanism for congestion control.

7 M

5 (a) Enlist services provided by transport layer. What is socket? Explain its importance at transport layer protocols.

7 M

5 (b) What is the role of Domain Name Server (DNS) in Internet? Explain the hierarchy of various domain names.

7 M

5 (c) (i) Give differences between TCP and UDP.

3 M

5 (c) (ii) Frame = 1 1 0 1 0 1 1 1 1 1 , Generator = 1 0 0 1 1 Calculate CRC.

4 M

5 (d) Write notes on following: 1. HTTP 2. MIME.

7 M

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