Computer Communication & Telecom Networks - Dec 2011

Electronics & Telecomm. (Semester 6)

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) Why does UDP exist? Would it not have been enough to just let user processes send raw IP packets?(5 marks) 1 (b) It was shown that flooding can be used to determine the minimum hop route. Can it be used to determine the minimum delay route?(5 marks) 1 (c) What do we mean when we say that a bridge can filter traffic? Why is filtering important?(5 marks) 1 (d) Why does the Internet use a connection- less network service?(5 marks) 2 (a) What is ALOHA? Derive an expression for slotted and pure ALOHA.(10 marks) 2 (b) What is collision and collision domain? How collision and collision domain can be reduced? How can collision be detected? Explain CSMA/CD.(10 marks) 3 (a) What is ARQ? What are the types of ARQs? Explain Go Back N ARQ in detail.(10 marks) 3 (b) What is HDLC? What are HDLC frame types and mode of operation? Explain in detail one mode.(10 marks) 4 (a) Write Dijkstra's Algorithm. Find the shortest path to destination node 6. Will BellMan Ford Algorithm yield the same solution? Why and why not?
(10 marks) 4 (b) What is QoS? Explain various techniques to improve QoS.(10 marks) 5 (a) Explain TCP Header in detail.(10 marks) 5 (b) What is classful IP addressing? Find Maximum addresses by each class.(10 marks) 6 (a) What is open system? Explain OSI model by drawing sender, receiver, intermediate node and various communication between them.(10 marks) 6 (b) Compare various switching methods.(10 marks) 7 (a) Write a note on Delay Model.(7 marks) 7 (b) Write a detailed note on Leaky Bucket Algorithm.(7 marks) 7 (c) Transmission Impairment cause and solution.(6 marks)