Suppose two nodes, A and B, are attached to opposite ends of an 800m cable, and that they each have one frame of 1500 bits (including all headers and preambles) to send to each other. Both nodes attempt to transmit at time t = 0. Suppose there are four repeaters between A and B, each inserting a 0.2 microsecond (0.2*10^-6 sec) delay. Assume the transmission rate is 100 Mbps, and CSMA/CD with backoff intervals of multiples of 512 bits is used. After the first collision, A draws K = 0 and B draws K = 1 in the exponential backoff protocol.

a.What is the one-way propagation delay (including repeater delays) between A and B in seconds? Assume that the signal propagation speed is 210^8m/sec.

b.At what time (in seconds) is As packet completely delivered at B?