Whether you're preparing for the CCNA certification exam or not, you must be prepared for the following question:

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"Hey, I reloaded this router and it wants an enable password. Do you know it?"

Because if you don't, and there's no one available who does, you need to perform a password recovery technique on the router - without erasing the current configuration. This involves manipulating the config register, and a misstep here can be fatal to the router's chances of…