Computer Network - May 2014

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) What is the different between a protocol, a service and an interface ?(5 marks) 1 (b) List the advantages of fiber optics as a communication medium.(5 marks) 1 (c) Discuss the merits of the OSI reference model.(5 marks) 1 (d) Define the following with examples :-
MAC address, IP address, Baud rate, Latency.(5 marks) 2 (a) Explain sliding window protocol using Go-Back-n Techniques.(10 marks) 2 (b) (i) State and explain the duties of the Data Link Layer.(7 marks) 2 (b) (ii) Assume that character Stuffing methods of framming is being used with each data frame preceded by the character sequence DLE STX and ending with DLE ETX. If the data to be transmitted is A DLE B DLE ETX, show what os the actual transmitted frame. DLE stands for the Data Link Escape character.(3 marks) 3 (a) How are collisions handled by a 1-persistent CSMA protocol? Give an example of a collision free multiple access protocol and explain in detail.(10 marks) 3 (b) What are the different types of routing protocols ? Explain distance vector routing.(10 marks) 4 (a) What are the congestion prevention policies? Explain congestion control in virtual circuit and datagram subnets.(10 marks) 4 (b) What is traffic shaping? Explain Leaky bucket algorithm(10 marks) 5 (a) Explain the different classes of IP addresses. Identify the class of the follow IP addresses and give their defaults subnet masks:-
(i) 227.56.83.0
(ii) 114.22.43.21
(iii) 129.14.12.21
(10 marks) 5 (b) Difference between
(i) OSPF and BGP
(ii) TCP and UDP(10 marks) 6 (a) Explain the function of the different internetworking components and state layer in which they work.(10 marks) 6 (b) Explain in details the fields of the IPV4 header with a neat diagram.(10 marks)

Short note on (any two) :-

7 (a) TCP connection establishment and release(10 marks) 7 (b) Transport services primitives(10 marks) 7 (c) Berkely Sockets(10 marks) 7 (d) Satellite Communication(10 marks)