Problem 4: Consider a time-slotted local area network where connected stations employ a 1- persistent carrier sense multiple access (CSMA) scheme to access the physical medium. Assume that the following exponential backoff algorithm is employed after a collision: The delay is an integral multiple of the slot duration T, the latter being equal to twice the maximum propagation delay across the medium. The number of slot times to delay before the i-th retransmission attempt is chosen as a random integer r, uniformly distributed in the range 0 Sr