Discussion
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?
Answer: B
Correct answer: Part of the command is missing.
There is no show serial command in IOS. The interface has to be reached through show interfaces, so the correct form is show interfaces serial 0/0 and the parser rejects serial as the first token it does not recognise. The space between the type and the number is perfectly legal - it appears in the correct command - and the error says nothing about whether the interface exists, since the command never got far enough to look.
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