Computer Network - Dec 2015

Computer Engineering (Semester 5)

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) Discuss the design issues for various layers.(5 marks) 1 (b) Compare various types of network topologies.(5 marks) 1 (c) Differentiate between an IP address and a MAC or physical address. What is the need to map IP address to MAC address? Explain which protocol does this. Similarly give a protocol which does reverse mapping.(5 marks) 1 (d) What is subnetting? What are the default subnet masks? Find the subnet address if the IP address is 129.31.72.24 and subnet mask is 255.255.192.0(5 marks) 2 (a) What is controlled access for collision control? Explain all the methods of controlled access.(10 marks) 2 (b) What is the maximum window size allowed for selective repeat ARQ?(10 marks) 3 (a) What are the different types of routing algorithms? When would we prefer to use hierarchical routing over Link state routing?(10 marks) 3 (b) What is traffic shaping? Explain leaky bucket algorithm and compare it with token bucket algorithm.(10 marks) 4 (a) What are transport service primitives? Discuss in brief.(10 marks) 4 (b) Explain IPv4 header format in detail. If value at HLEN field is 1100 find the size of option and padding field?(10 marks) 5 (a) What is congestion control? Explain various congestion prevention policies.(10 marks)

Write in brief about:

5 (b) (i) PPP Frame format(5 marks) 5 (b) (ii) CSMA/CD(5 marks)

Write short notes on (any two)

6 (a) TCP connection management(10 marks) 6 (b) Inter-networking Devices(10 marks) 6 (c) Border Gateway Protocol(10 marks)