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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. Show the operation of MACA algorithm ? Will there be any collision here ? Justify. Describe the operation of token bucket traffic shaper. 5 5 What happens in congestion avoidance and congestion detection phases of TCP's congestion control mechanism ? Discuss through an illustration. How does the size of congestion window increase in congestion avoidance phase. 3+3+2=8 Explain the Diffie Helman method for key 7 exchange through an example. 2. 5 How does statistical TDM try to resolve shortcomings inherent in synchronus TDM ? 5 What is count to infinity problem ? Explain through an example. 5 (d) Show the status of sender's and receivers window of 4 bit sliding window mechanism. How does it increase utilization of channel bandwidth ? 3. (a) How does ADSL support high internet access over slow telephone lines ? Why it is called asymmetric ? 5 (a) What is silly window syndrome ? How it is created by the sender ? What is the proposed solution ? Discuss. 2+3+3=8 MCS-042 2 Explain the operation of CSMA/CD. What happens when a station detects a 4+2=6 collision ? Discuss the Triple DES scheme. What type 6 of attack can be avoided with this mechanism ? 4. 5. (a) Compare the TCP header and the UDP header. List the fields in the TCP header that are missing from UDP header. Give the reason for their absence. List and discuss all the fields of IP datagram header which relate to fragmentation. Draw the 802.11 protocol stock and explain its components in brief. (a) Describe the operation of OSPF. Illustrate quadrature amplitude modulation (QAM) using appropriate diagram. Differentiate between the following : Class A and Class B address Visual circuit and diagram subner (iii) Upward and Downward multiplexing. -o0o- MCS-042 3 6 6 8 6 5 9

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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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