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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”HH 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 fourPieces 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 HWhich of I1, I2, I3, and I4 can an intruder learn through sniffing at R2 alone?
Explanation:ü At router R2 only R1 and R3 link address is available so intruder cant see the link address of Q and H.ü At Session layer URL is very well encrypted by DES so intruder cant see the URL address.ü At Network layer header contains source as well as destination IP address so intruder can easily see at Router R2.ü TCP port number of source and destination are present in TCP header so intruder can easily see at Router R2.Hence option 3 is the correct answer.
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