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Assume two nodes, A and B, are attached to opposite ends of 100m cable, and that they each have one frame of 1000 bits (including all headers and preambles) to send to each other. Both nodes try to transmit at time t=0. Suppose the transmission rate is 100Mbps, and CSMA/CD with Backoff intervals of multiples of 512 bits is used. After nth collision, A draws K=0 and B draws K=2n-1 in exponential backoff protocol. Ignore jam signal and interframe space and suppose that signal propagation speed in medium is 2*108 m/sec.

a. When does station A detects first collision?
b. At what time (in seconds) is A's packet completely delivered at B?

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