Computer Networking
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.

KIK (1 + F)
None of these
1/ (1 - F)
K I (K - P)
P I (K + 1)

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Computer Networking
What is the problem with an interface if you type show interface serial 0 and receive the following message? "Serial0 is administratively down, line protocol is down."

No cable is attached.
The administrator has the interface shut down.
The administrator is pinging from the interface.
The keepalives are different times.

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