Computer Networking
You type the following command into the router and receive the following output:Router#show serial 0/0 ^% Invalid input detected at '^' marker.Why was this error message displayed?

You cannot have a space between serial and 0/0.
You need to be in privileged mode.
Part of the command is missing.
The router does not have a serial0/0 interface.

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Computer Networking
The packets switching concept was first proposed

in the late 1980s for the Defense Ministry of US.
in the late 1950s for Defense Ministry of US
in the early 1960s for military communication systems, mainly to handle speech
All of these
None of these

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