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GATE Computer Science (CS) 2014 Shift 2 Solved Paper

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Question : 37 of 65

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An IP machine Q has a path to another IP machine H via three IP routers R1, R2, and R3.

Q—R1—R2—R3—H

H acts as an HTTP server, and Q connects to H via HTTP and downloads a file. Session layer Encryption is used, with DES as the shared key encryption protocol. Consider the following four

Pieces of information:

[I1] The URL of the file downloaded by Q

[I2] The TCP port numbers at Q and H

[I3] The IP addresses of Q and H

[I4] The link layer addresses of Q and H

Which of I1, I2, I3, and I4 can an intruder learn through sniffing at R2 alone?

Only I1 and I2
Only I1
Only I2 and I3
Only I3 and I4

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