m.sc. - comp. sci

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Total No. of Questions : 5 ] [Total No. of Pages : 3 [4339] - 102 M.Sc. (Semester - I) COMPUTER SCIENCE CS - 102 : Advanced Networking (2011 Pattern) Time :3 Hours] [Max. Marks :80 Instructions to the candidates: 1) Neat diagrams must be drawn wherever necessary. 2) Figures to the right indicate full marks. 3) All questions are compulsory. P594 Q1) Attempt all of the following : [8 × 2 = 16] a) Why CSMA/CD is not used in gigabit ethernet ? b) List any two advantages & disadvantages of ECB & CBC mode. c) Why does RTP needs the service of another protocol, RTCP, but TCP does not ? d) How timestamps -based authentication works ? e) What is DNS spoofing ? f) A routing table has 25 entries. It does not receive information about five routers for 200 sec. How many timers are running at this time ? g) In an IP packet, the value of HLEN is 1000 in binary. How many bytes of options are being carried by this packet ? h) Why is anonymous offline electronic money dangerous ? Q2) Attempt any four of the following : [4 × 4 = 16] a) When a user wants to send an email to multiple recipients, how PGP handles the security ? P.T.O. SEAT No. :

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M.Sc. - Comp. Sci.

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