COMPUTER NETWORKS (CN) DECEMBER 2011 COMPUTER SCIENCE SEMESTER 5

COMPUTER NETWORKS (CN) DECEMBER 2011 COMPUTER SCIENCE SEMESTER 5 

1.	Answer following questions in brief :-	20
(a)	What is the principle difference between connectionless communication	(5x4)
	and connection oriented communication ?
(b)	Consider the delay of pure ALOHA versus slotted ALOHA at low load.
	Which one is less ? Explain four answer.
(c)	Give one advantages of RPC on UDP over transactional TCP. Give one
	advantage TCP over RPC.
(d)	Compare and contrast a circuit switching and packet switching network.
2. (a)	Define fragmentation and explain why the IPV4 and IPV6 protocols need	10
	to fragment some packets. Is there any difference between the two
	protocols in this matter ?
(b)	An 8 bit byte with binary values 10101111 is to be encoded using an even	10
	parity Hamming code. What is the binary value after encoding ?
3. (a)	What is the function of TCP protocol ? Discuss it's header format.	20
(b)	Explain sliding window protocol using Go Back-M Techniques.
4. (a)	Explain Dijkstra's algorithm as shortest path routing with example	20
(b)	Explain working of following network components and state in which layer
	they work. Repealers, Hubs, Bridges, Routers and Switches and Gateways.
5. (a)	What is IPV4 protocol? Explain the IPV4 Header format with diagram.	20
(b)	What is purpose of Digital Subscriber Line (DSL) ? Explain ADSL.
6. (a)	What are transport service primitives ?	20
(b)	Explain framing, flow and error control in data Link layer.
7.	Write short notes on (any four) of the following :-	20
	(a) SONET
	(b) ADHOC Networking
	(c) Bluetooth Architecture
	(d) Comparison of 802.3 and 802.11
	(e) Berkeley Socket.