Computer Networks 1 - Dec 2012
Computer Science Engg. (Semester 5)
TOTAL MARKS: 100
TOTAL TIME: 3 HOURS (1) Question 1 is compulsory.
(2) Attempt any four from the remaining questions.
(3) Assume data wherever required.
(4) Figures to the right indicate full marks. 1 (a) What is protocol? Define the key elements of protocol ?(5 marks) 1 (b) Define network topology ,Explain ring topology with advantages and disadvantages(5 marks) 1 (c) Explain the different levels of addressing used in an internet with a suitable example for each level of addresing in TCP/IP ?(10 marks) 2 (a) Explain the following:
Jitter(5 marks) 2 (b) Explain with the block diagram the cause for transmission inpairmainrts .(9 marks) 2 (c) Explian with neat waveform any two polar line coding schemes(6 marks) 3 (a) What is multiplexing ? Explain with a neat diagram FDM.(8 marks) 3 (b) Explain how time- divison - multiplexing difffers from FDM ,With a neat diagram?(4 marks) 3 (c) What is switching ? Differentiate circuit switch network with packet -Switched network(8 marks) 4 (a) What is internet checksum? List the steps udertaken by sneder and receivar for error detection.(6 marks) 4 (b) Expalin with an example of block coding method for error detection and correction ?(10 marks) 4 (c) What is the hamming distance ? Find the minimum hamming distance of the coding scheme show in the table
|Data word||Code word|
(4 marks) 5 (a) Calculate the time to send 2 milion bits of dat in a system the uses stop and wait protocols .If the distance between sender and receiver is 2000km .Assume packet size 400bits and propagation speed is 2 ×108m.no data or control frame is lost(10 marks) 5 (b) Explain the frame formats and transmitional phase of point -to -point protocol(10 marks) 6 (a) Explain why colllision in an random access protocol but in controllled acess or channelizing protocol?(4 marks) 6 (b) Explain any two popular control access method ,With a neat diagram(8 marks) 6 (c) Explain 802.3 MAC frame formate(8 marks) 7 (a ) Explain the service of IEEE 802.11 standard (4 marks) 7 (b) Write a short note on:
Celleular telehone(10 marks) 7 (c) Explain the five standard of Imt -2000radio -interface of 3G system?(6 marks) 8 (a) Expalin briefly the advantages of IPV6(6 marks) 8 (b) Find the metid and hostid of the following IP address?
220.127.116.11(8 marks) 8 (c) Write short note on network addreess translation (NAT)(6 marks)