Question
Consider two connected transport entities, A and B. A wants to terminate the connection, and hence, it initiates a connection release by sending a Disconnect
Consider two connected transport entities, A and B. A wants to terminate the connection, and hence, it initiates a connection release by sending a Disconnect Request (DR) segment to B. Assume that the two-parties implement the DR-DR-ACK mechanism of connection release taught in class. Further, assume that the one-way transmission delay between A and B to be a parameter d (in milliseconds), which remains constant for the entire session. The parameter d can be calculated from your roll number, by adding all the letters and digits, and then calculating the remainder modulo-10. The letters are assumed to have the following numerical values: A=1, B=2, Z=26. For example, if your roll number is 15YZ12345, then d = (1 + 5 + 25 + 26 + 1 + 2 + 3 + 4 + 5) (mod 10) = 2 ms. Assume the delay to be symmetric in both the directions, and assume that segment processing and required actions happen instantaneously (incurring zero delay) at the two ends of the connection. Also, assume that the time-out interval for any segment sent by either party is 3d, and that unilateral connection release happens at A if there is no response after N = 5 timeouts following the initial sending of the DR segment, and that at B happens after a time interval 15d since the first response DR has been sent back to A. Given your roll number, calculate the time interval after the first DR segment is sent out by A, at which A and B will release the respective connections at their ends, in the following situation: (a) no segment sent by either party is lost; (b) the first DR segment sent by B in response to the DR segment received from A is only lost, and, (c) only the first DR segment sent from A to B is successfully delivered, every following segment from either parties is lost.
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