Computer Networking
Which of the following refers to the terms "residual error rate"?

the number of bit errors per twenty four hours of continuous operation on an asynchronous line
None of these
signal to noise ratio divided by the ratio of energy per bit to noise per hertz
The probability that one or more errors will be undetected when an error detection scheme is used
the probability that one or more errors will be detected when an error detection mechanism is used

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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."

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

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