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1 2 . 3 The binary exponential backoff algorithm is defined by IEEE 8 0 2 as follows: The delay is an integral multiple of

12.3 The binary exponential backoff algorithm is defined by IEEE 802 as follows:
The delay is an integral multiple of slot time. The number of slot times to delay
before the nth retransmission attempt is chosen as a uniformly distributed random
integer r in the range 0r2K, where K=min(n,10).
Slot time is, roughly, twice the round-trip propagation delay. Assume that two sta-
tions always have a frame to send. After a collision, what is the mean number of
retransmission attempts before one station successfully retransmits? What is the
answer if three stations always have frames to send?
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