Functions of OSI and TCP/IP Layers Q.49

49An 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?

Option : C
Explanation :

Since, the router R₁ contains TCP part numbers of Q and R₂ contains the TCP part numbers of H at Data link layer, and with both routers contains IP addresses of Q and H at Network layer. So, only statement I₂ and I₃ will be true.

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