Computer Networks - May 2015

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. 1 (a) A datagram cannot be larger than the MTU of network over which it is sent. 'Is the statement true or false? Explain with the help of suitable example. 37467,Define Business Intelligence" and "Decision Support System" with examples.(5 marks) 1 (b) Suppose you have to develop an error recovery protocol fora link that is unreliable and delay sensitive, which of the following protocol, would you to choose? Justify your answer.
i) Stop and wait
ii) Selective repeat
iii) Go back(5 marks) 1 (c) How congestion is controlled in TCP?(5 marks) 1 (d) The size of option field of an IP datagram is 20 bytes. What is the value of HLEN? What is the value in binary?(5 marks) 2 (a) What is OSI model? Give the function and services of each layer.(10 marks) 2 (b) What is routing in network? Ex;plain shortest path routing protocol.(10 marks) 3 (a) Explain the different classes of IP addresses and need of subnetting with the help of example.(10 marks) 3 (b) Differentiate between message switching, circuit switching and packet switching.(10 marks) 4 (a) What is pure ALOHA and Slotted ALOHA? What is the efficiency. Justify your answer.(10 marks) 4 (b) Draw and explain TCP Segment Header.(10 marks) 5 (a) Differentiate between TCP and UDP.(10 marks) 5 (b) Explain the different transmission media in networking.(10 marks)

Write short notes on the following (any four):

6 (a) BGP(5 marks) 6 (b) HDLC(5 marks) 6 (c) TCP Timers(5 marks) 6 (d) Hubs, Switches and Bridges(5 marks) 6 (e) CRC and checksum.(5 marks)