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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