Computer Networking
ICMP (Internet Control Message Protocol) is

a protocol that handles error and control messages
a protocol used to monitor computers
a TCP/IP high level protocol for transferring files from one machine to another
a TCP/IP protocol used to dynamically bind a high level IP Address to a low-level physical hardware address
None of these

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

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