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Question
Data link layer retransmits the damaged frames in most networks. If the probability of a frame's being damaged is p, what is the mean number of transmissions required to send a frame if acknowledgements are never lost.
Options:
A .  KIK (1 + F)
B .  P I (K + 1)
C .  1/ (1 - F)
D .  None of these
E .  K I (K - P)
Answer: Option C

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