MU 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) Why there is a need for layered designing for networking and communication? Compare the TCP/IP and OSI reference models.
10 M
1 (b) Explain the modes of propagating light along optical channels. What are the advantages over other guided media?
10 M

2 (a) Explain the need for DNS and describe the protocol functioning.
10 M
2 (b) Explain the different elements of transport protocols.
10 M

3 (a) Explain how TCP handles error control and flow control.
10 M
3 (b) Why is flow control needed? What are the mechanisms? Explain how the Go-Back-N and Selective Repeat ARQ differ from each other.
10 M

4 (a) Why there is a need for congestion control? What are the different mechanisms? Explain them.
10 M
4 (b) Explain CSMA Protocols. Explain how collisions are handled in CSMA/CD,
10 M

5 (a) Why there is need for farming?
The following encoding is used in a data link protocol:
A:01000111; B:11100011; FLAG: 01111110; ESC:11100000
Show the bit sequence transmitted (in binary) for the four character frame: A B ESC FLAG
when each of the following framing methods are used:
a) Character count
b) Flag byte and byte stuffing
c) Starting and Ending flag bytes, with bit stuffing.
10 M
5 (b) Compare the network layer protocols Ipv4 and Ipv6.
10 M

Give Short notes on any four:
6 (a) SNMP
5 M
6 (b) HTTP
5 M
6 (c) BGP
5 M
6 (d) Ethernet
5 M
6 (e) Virtual LAN
5 M



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