Q. In a ................................attack, an intruder comes between two communicating parties, Intercepting and replying to their messages.

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Q. A computer crime is

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Q. A program that migrates through networks and operating systems by attaching itself to different Programs and databases is a

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Q. In RSA.............................in the common factor in both keys?

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Q. Programs that come into a computer system disguised as something else are called

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Q. Having a(n) .....................................is important to help large Organization continue operating until Normal computer operations.

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Q. In what way does a firewall increase the securities of a VPN?

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Q. Choose the false one.

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Q. There are 15 users communicating to each other. How many pairs of keys are required to authenticate the communications if the symmetric key is used?

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Q. Let the value of the RTT(Round-Trip-Time)is to be measure (d). The value of the previous RTT be 350μs. Let the value of α be 90% the new RTT, hence the retransmission time is ______ .(Assume it takes a segment at this moment to be acknowledged in 90μs)

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Q. Suppose a web server application generates messages consisting of 120 bytes if every second to the Central host, and each message gets encapsulated in a UDP segment and then an IPV4 Datagram. There are no options added in the TCP (or) Ip headers. What percentage of each Datagram will consist of data generated by the application?

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Q. Suppose that a TCP entity receives 2 MB file from the application layer and the IP layer is willing to Carry blocks of maximum size 1600 B; calculate the amount of overhead incurred from Segmenting the file into packet-sized units. Assume both TCP and Ip header of 20 B.

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