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IGNOU UNIVERSITY MCA - II (SEM 4) JUN 2010 : Data Communication and Computer Networks

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No. of Printed Pages : 3 MCS-042 MCA (Revised) Term-End Examination (N) June, 2010 MCS-042 : DATA COMMUNICATION AND COMPUTER NETWORKS Maximum Marks : 100 Time : 3 hours Note : Question number / is compulsory. Attempt any three questions from the rest. 1. (a) Explain different phases of Connection Oriented Transmission. Define cellular topology. Discuss advantages and disadvantages of cellular topology in wireless data transfer. Discuss advantages and disadvantages of -flooding routing protocols. A network with bandwidth of 10 Mbps can pass only an average of 12000 frames/min with each frame carrying an average of 10000 bits. What is throughput of this network ? Illustrate ideal, achievable, =congested and congested network characteristics using appropriate diagram. MCS-042 1 6 6 5 5 5 P.T.O. Derive the expression to establish the relation between S and G in Pure Aloha ? Explain and illustrate Sliding Window Protocol. How is network congestion controlled using slow start in TCP ? (c) MCS-042 7 6 Compare Dijkstra and Bellman Ford algorithms for finding the shortest path. 7 7 Compare FDM and TDM. 4. 7 How is OSPF implemented in IP network. Illustrate. (c) What is the purpose of PCM ? Explain different components of PCM encoder. What are features of tocken bucket traffic shaper ? 3. 6 Why a fragmentation is needed in IP datagram ? How are fragmentation and reassembly implemented in IP ? (c) 7 Describe how is MACAW an improvement over MACA ? 2. 8 6 With the help of a suitable diagram explain Go Back N and compare it with selective repeat. 7 2 5. (a) With the help of suitable diagram, explain three way handshake mechanism. 7 Discuss different component of Network File System protocol. 7 What are the benefits of using digital certificate ? 6 MCS-042 3

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Additional Info : Mca - II (sem 4) June 2010 Question Paper - Data Communication and Computer Networks(Revised Course)
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