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

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MCA (Revised) ro Term-End Examination bD june, 2 009 l.n) MCS-042: D ATA C OMMUNICATION A ND COMPUTER N ETWORKS Time : 3 h ours Note : 1. Maximum M arks : 1 00 n Q uestion umber1 .i s c ompulsory.A ttempt a ny t htee questions f to* t he r est. - ( u) W hat i s t he d ifference b etween a p ort 3 +2 address,a l ogical a ddress a nd a p hysical address,w hich t ype o f a ddress c hanges from hop to hop. (b) A ssume w e n eed t o d ownload a t ext document a t t he r ate o f 1 000 P ageso f s ize 24 r ows w ith 2 5 c haracters p er r ow i n a 5 i page p er m inute. \ uVhats t he r equired b it rate of the channel ? (c) C alculate c hannel c apacity f or a t elephone line w hich n ormally h as a b andwidth o f 300 t o 3 300 H z. T he S /N t s 3 \62. I n c ase we h ave t o t ransfer d ata w ith h igh r ate, 5 what i s r equired t o b e d one ? MCS-042 P.T.O. ( d) IAIhat i s e xposed s tation p roblem i n w ireless 5 LAN e nvironment ? E xplain. (") For w hat p urpose i s l eaky b ucket a lgorithm 5 used? E xplain t he a lgorithm ? (f) What are the three phases in TCP's congestion c ontrol m echanism? E xplain with t he h elp o f a d iagram. H ow d oes t he size o f a c ongestion w indow i ncrease i n t he first p hase ? 2+5+3 (g) 2. W hat i s t he e ssentialp roperty o f F iestel Cipher n etwork ? E xplain. (u) What are different 5 variants of polar encodings. D iscuss t hrough e xamples. W hat are i ts a dvantages a nd d isadvantages. (b) 1 +6+3 D efine p iggybacking a nd p ipelining. W hy 5 there is no pipelining in stop and wait ARQ ? (.) 3. \ rVhat a re t he u ses o f f looding a lgorithm ? 5 (u) \AIhy h as E thernet i mposed r esfrictions o n E both the minimum and maximum length of a f rame ? E xplain. (b) How i s S illy w indow S yndrome c reatedb y the r eceiver ? W hat i s t he p roposed solution? D iscuss. 3+1+3 (.) How does encryption and decryption take place in RSA ? MCS-042 8 4. ( u) D iscussa nd s how t he p rocesso f c orrection establishmentand termination in TCP. How does i t h andle d elayed a rrival o f S YN a nd ACK p ackets ? (b) D raw a nd e xplain t he f low d iagram o f Bellman F ord a lgorithm. (.) S how t he v ulnerable t ime f or p ure A loha protocol a nd o btain a n e xpressionf or throughput. 5. ( a) D iscusst he d ifficulties t hat o ne e ncounters when t rying t o b uild a b ridge b etween t he various E thernet,T okenR ing a nd T oken B us LANs. (b) W hat i s t he m ain a dvantageo f u sing B GP protocol ? E xplain t hrough a n e xample. (c) D iscusst he p urpose o f u sing v arious f lags and d ata o ffset i n t het T CP h eader. (d) I llustrate a nd c ompare c ircuit s witching, messages witching a nd p acket s witching. -oOo- MCS-042

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