What are the three common IOS error messages when you enter an incorrect command?

Question

Accepted Answer

"Ambiguous command" (too few characters), "Incomplete command" (missing keyword/argument), and "Invalid input detected" (the ^ marks where it went wrong).

Error Message
Meaning

Ambiguous command
Not enough characters entered to identify the command

Incomplete command
Required keywords or arguments are missing

Invalid input detected at '^' marker
Command was entered incorrectly; the caret (^) shows where the error occurred

Error Message	Meaning
Ambiguous command	Not enough characters entered to identify the command
Incomplete command	Required keywords or arguments are missing
Invalid input detected at '^' marker	Command was entered incorrectly; the caret (^) shows where the error occurred