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

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Computer Networking
A front-end processor is

a user computer system
a processor in a large-scale computer that executes operating system instructions
preliminary processor of batch jobs.
a minicomputer that relieves main-frame computers at a computer centre of communications control functions
None of these

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