Total No. of Questions: 091 [Total No. of Pages: 02
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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.
2) Section-E CompulsorY.
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
Q2) (a) What is the hamming distancefor the following codes:
d( 10000,0 I 000)d(0000,
0000, I 000)d(0000,
(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?
Q3) ,(a) A system has an n-layer protocol hierarchy.Applications'generate
messages length M bytes.At eachof the layer, an h-byte headeris
added.What fraction of the network bandwidthis filled with the headers?
(b) Draw a comparisonbetweencircuit, packet and message switching
Q4) (a) Explain in what ways OSI and-I'CP/IPreferencemodelsare sameand
(b) Write a detailednoteon UnguidedMedia.
J-321 [SI2el PTO.
used or spannedby the CIDR address
Qs) (a) What are the IP addresses
(b) Explainthe working of slidingwindow protocolby takinga examplern
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
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
(b) Explain the processof connectionestablishment TCP.
(10x 2: 20)
Qe) a) Explain the differencebetweenbit rateandbaudrateby taking suitable
b) Explain the differencebetweenburst eiror and two isolatedsingle bit
c ) What doesthe amplitude,frequencyand phaseof a signalmeasure?
d) Explain the role of routers,switchesand bridgesin a network.
e) Give the advantages disadvantages UTP and STP Cables.
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