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This is GATE 2014 set-2 question....

My question is what would be the ans if intruder is sniffing at Router 1 ??? then according to me ans should be option c and d

 

Q.27 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?
(A) Only I1 and I2
(B) Only I1
(C) Only I2 and I3
(D) Only I3 and I4

1 Answer

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Yes, packet sniffing at R1 will have information about TCP port number for Q and H, IP address of Q and H, and the link layer address of Q only, since the DLL will only know the address of the immediately connected physical link (ie MAC address) and not aware of the DLL of the H node, which is, although on 'a logical' link with Q, but different physical link with R1.
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