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IGNOU UNIVERSITY MCA - II (SEM 4) DEC 2009 : Data Communication and Computer Networks

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MCS-042 MCA (Revised) Term-End Examination December, 2009 MCS-042 : DATA COMMUNICATION AND COMPUTER NETWORKS Maximum Marks : 100 Time : 3 hours Note : Question number 1 is compulsory. Attempt any three questions from the rest. 1. (a) Consider an error free 64 kbps satellite channel used to send 512 bytes data frames in one direction. Propagation time is 270 m sec in one direction. Compare the window size assuming that the size of acknowledgement is neghligible. 6 4 Sketch the Manchester, Differential Manchester, NRZ-L and NRZ-I for the following bit stream : 0001110101 A digital signalling system is required to operate at 9600 bps. If a signal element encodes a 4 bit word, what is the minimum required bandwidth of a noiseless channel ? MCS-042 1 5 P.T.O.

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Additional Info : Mca - II (sem 4) December 2009 Question Paper - Data Communication and Computer Networks(Revised Course)
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