Question: 4. Consider two nodes X and Y on the same 10 Mbps Ethernet segment such that the one-way propagation delay between them is 200 bit-times.

4. Consider two nodes X and Y on the same 10 Mbps Ethernet segment such that the one-way propagation delay between them is 200 bit-times. Consider next an event at t = 0 bit-times, where the frames sent by these nodes collide due to simultaneous transmission. Thus, this collision is detected by both X and Y at t = 0. Now, X and Y must choose independently the value of K based on the CSMA/CD algorithm for the subsequent re-transmission as KX = 0 and KY = 1, respectively. Assume that each node does carrier sensing for 96 bit-times before beginning transmission, and issue a jamming signal for 48 bit-times on detecting collision. Assume bit-time as the unit of time in the following sub-parts: (i) At what time does Y schedule its re-transmission? (ii) At what time does X begin its re-transmission? (iii) At what time does Xs signal reach Y? (iv) Does Y refrain from transmitting at its scheduled re-transmission time? Why or why not? (v) Can the re-transmissions from X and Y collide? Why or why not?

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