Discussion
Data link layer retransmits the damaged frames in most networks. If probability of a frame's being damaged is p, then what is the mean number of transmissions required to send a frame if acknowledgements are never lost ?
Answer: B
Correct answer: 1 / K - P
If each transmission fails with probability p independently, the number of attempts is geometric and its mean is \( 1/(1-p) \). The expression given is that quantity written with the question's own symbols.
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