Computer Networks - Dec 2011

Information Technology (Semester 4)

TOTAL MARKS: 80
TOTAL TIME: 3 HOURS (1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Assume data if required.
(4) Figures to the right indicate full marks.

Answer the following questions in brief:-

1 (a) What is the principle difference between connectionless communication and connection oriented communication?(5 marks) 1 (b) Consider the delay of pure ALOHA versus slotted ALOHA at low load. Which one is less? Explain your answer.(5 marks) 1 (c) Give one advantage of RPC on UDP over transactional TCP. Give one advantage TCP over RPC.(5 marks) 1 (d) Compare and contrast circuit switching and packet switching network.(5 marks) 2 (a) Define fragmentation and explain why the IPv4 and IPv6 protocols need to fragment some packets. Is there any difference between the two protocols in this matter?(10 marks) 2 (b) An 8 bit byte with binary values 10011010 is to be encoded using an even parity hamming code. What is the binary value after encoding?(10 marks) 3 (a) What is the function of TCP protocol? Discuss its header format.(10 marks) 3 (b) Explain sliding window protocol using Go Back-M Techniques.(10 marks) 4 (a) Explain Dijkstras^'s algorithm as shortest path routing with example?(10 marks) 4 (b) Explain working of following network components and state in which layer they work? Repeaters, Hubs, Bridges, Routers, Switches and Gateways.(10 marks) 5 (a) What is IPv4 protocol? Explain the IPV₄ Header format with diagram? (10 marks) 5 (b) What is purpose of Digital Subscriber Line (DSL)? Explain ADSL.(10 marks) 6 (a) What are transport service primitives?(10 marks) 6 (b) Explain framing, flow and error control in data Link layer? (10 marks)

Write short notes on (any four):-

7 (a) SONET.(5 marks) 7 (b) ADHOC Networking.(5 marks) 7 (c) Bluetooth Architecture.(5 marks) 7 (d) Comparison of 802.3 and 802.11.(5 marks) 7 (e) Berkeley Socket.(5 marks)