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Data Communication And Computer Networks Question Paper

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					    Roll No"
    Total No. of Questions: 091                                    [Total No. of Pages: 02
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                                         - 2"u)
                                 MCA (SeYn.
          DATA COMMUNICATION AND COMPUTER NETWORKS
                    SUBJECTCODE :MCA - 203(N2)
                         PaperID : [801081
                        lNote: Please subject
                                    filt    codeandpaperID on OMRI

.   Time : 03 Hours                                    Maximum Marks : 60
    Instruction to Candidates:
         1) Attempt any one questionfrom eachSectionsA, B' C & D.
                      is
         2) Section-E CompulsorY.

                                      Section- A
                                                                            (1x10=10)
    QI)   (a) Explain the difference betweenAnalog and Digital Communicationby
              giving suitableexamples  showing in which conditionsAnalog is better
              and in which conditionDigital is better.
          (b) Draw a comparison between FDM, TDM and STDM Multiplexing
              Techniques.

    Q2) (a) What is the hamming distancefor the following codes:
                                   0000)
            d( 10000,0 I 000)d(0000,
                   o            oo00)
               0000, I 000)d(0000,
             d(1
          (b) We needto send265 kbps over a noiselesschannelwith a bandwidthof
              z}kblz. How many signallevelsdo we need?
          (c) We have a channelwith a I -MHz bandwidth. The SNR for this channel
              is 63. What arethe appropriate rateand signal level?
                                           bit
                                      Section- B
                                                                            (1x10=10)

    Q3) ,(a) A system has an n-layer protocol hierarchy.Applications'generate
             messages length M bytes.At eachof the layer, an h-byte headeris
                      of
             added.What fraction of the network bandwidthis filled with the headers?
        (b) Draw a comparisonbetweencircuit, packet and message           switching
             techniques.

    Q4) (a) Explain in what ways OSI and-I'CP/IPreferencemodelsare sameand
            wherethey differ.
        (b) Write a detailednoteon UnguidedMedia.

    J-321 [SI2el                                                                  PTO.
                                 Section- C
                                                                 (rxt0-10)
                                used or spannedby the CIDR address
Qs) (a) What are the IP addresses
         192.t68.10.0/20?
     (b) Explainthe working of slidingwindow protocolby takinga examplern
         whichwindowsizeis 3.

Q6) (a) What is the major drawbackof DistanceVector Routing Protocols?
        Explainwith the help of suitable   examplehow the problemoccursand
        write the solutionto rectiff that.
    (b) Explainthe difference  between  leakybucketandtokenbucketcongestion
        control algorithms.
                                 Section- D
                                                                 (1x10-10)

Q7) (a) If you haveto designa reliablebyte-stream    protocolthat usesa sliding
        window like TCP. This proto'colwill run over a 1-Gbpsnetwork. The
        RIT of the network is 140ms,and the maximum segmentlife is 60
        seconds. How many bits would you include in the AdvertisedWindow
        and SequenceNum     fields of your protocol header.
    (b) Write a short note on Flow Control and buffering in TCP.

Qs) (a) Showandexplaintherelationship      TSAPs,NSAPsandTransport
                                     between
         Connections.
                                                     in
     (b) Explain the processof connectionestablishment TCP.
                                 Section- E
                                                                 (10x 2: 20)
Qe) a) Explain the differencebetweenbit rateandbaudrateby taking suitable
        example.
     b) Explain the differencebetweenburst eiror and two isolatedsingle bit
         effors.
     c ) What doesthe amplitude,frequencyand phaseof a signalmeasure?
     d) Explain the role of routers,switchesand bridgesin a network.
                                                of
     e) Give the advantages disadvantages UTP and STP Cables.
                              and
     0 Write a shortnote on HDLC Protocol.
     g) Explain the needofsub nettingwith the help of suitableexample.
     h) Discussin brief the working of CSMA/CD Protocol"
     1)  What kind of servicesare provided by transportlayer to upper layers?
     )   Why lot of duplication is there in servicesprovided by transportand
         datalink layers?Identifuthem"

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J-321

				
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