Question: . Suppose Client A initiates a Telnet session with Server S. At about the same time, Client B also initiates a Telnet session with Server

  • . Suppose Client A initiates a Telnet session with Server S. At about the same time, Client B also initiates a Telnet session with Server S. Provide possible source and destination port numbers for

    1. The segments sent from A to S.

    2. The segments sent from B to S.

    3. The segments sent from S to A.

    4. The segments sent from S to B.

    5. If A and B are different hosts,is it possible that the source port number in the segments from A to S is the same as that from B to S?

    6. How about if they are the same host?

  • . UDP and TCP use 1s complement for their checksums. Suppose you have the following three 8-bit bytes: 00100011, 01001110, 01010100. What is the 1s complement of the sum of these 8-bit bytes? (Note that although UDP and TCP use 16-bit words in computing the checksum, for this problem you are being asked to consider 8-bit sums.) Show all work. Why is it that UDP takes the 1s complement of the sum; that is, why not just use the sum? With the 1s complement scheme, how does the receiver detect errors?

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