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Typing exit will take you back one level.
If you are in User mode, typing exit will log you out of the router.
Typing end or pressing the CTRL+Z keys will take you all the way back to the enable prompt.
Remember that you do not need to type the entire command.
Type the fewest number of characters to uniquely identify the command instead.
For example, to enter the enable mode, you can type enable, or just ena.
If the command does not work, the router will tell you by pointing to the character with a caret (^) symbol.