Computer Communication Networks - Dec 2012

Electronics Engineering (Semester 7)

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 difference between Network layer delivery and transport layer delivery?(5 marks) 1 (b) What is the difference between congestion control and flow control?(5 marks) 1 (c) In sliding window flow control method why size of window is one less than the module range?An(5 marks) 1 (d) What are the conditions to be satisfied for valid CRC generator polynomial? Draw block diagram of CRC generator.(5 marks) 2 (a) Explain CSMA/CD and its use. What part of 802 project uses CSMA/CD.(10 marks) 2 (b) Explain repeaters, Bridges, Routers and switches.(10 marks) 3 (a) Explain HDLC protocol with frame format.(10 marks) 3 (b) Explain ADSL in detail.(10 marks) 4 (a) What is exterior and interior routing? Explain in brief path vector routing and distance vector routing.(10 marks) 4 (b) Explain ISDN channel structure for basic and primary services.(5 marks) 4 (c) Explain Berkeley API.(5 marks) 5 (a) Apply Dijkstra's algorithm and bellman ford algorithm to the network given below. Find the least cost path from node 1 to all nodes as specified in the network.(12 marks) 5 (b) Distinguish between packet switching, circuit switching and virtual circuit packet switching.(8 marks) 6 (a) Explain LAN protocol architecture with IEEE 802 reference. Sketch the general MAC frame format and LLC PDU structure. Explain the functions of different fields.(10 marks) 6 (b) Explain SONET/SDH in detail.(10 marks) 7 (a) Explain SMTP and HTTP.(5 marks) 7 (b) Explain bit stuffing(5 marks) 7 (c) How does reservation work with medium access protocol?(5 marks) 7 (d) Discuss various network topologies.(5 marks)