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  • I Advice - Cisco CCNA Certification Exam Tutorial: The Config Register And Password Recovery

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    by reloading the router and sending a BREAK signal during the first 60 seconds of the reload. Depending on the terminal program you're using, this can be the hardest part of the entire process! For most, just press CTRL-BREAK during this
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    Whether you're preparing for the CCNA certification exam or not, you must be prepared for the following question:

    "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 recovery!

    Obviously, that can make you pretty nervous about changing the config register, CCNA or not. Different Cisco routers and switches have different techniques for password recovery, so the following discussion is limited to the 2500 series. If you need to do this for another model, do a quick search engine check for "password recovery cisco" and you should quickly find a document for the Cisco router you're working with.

    For the 2500 series, you start by reloading the router and sending a BREAK signal during the first 60 seconds of the reload. Depending on the terminal program you're using, this can be the hardest part of the entire process! For most, just press CTRL-BREAK during this o

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    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 recovery!

    Obviously, that can make you pretty nervous about changing the config register, CCNA or not. Different Cisco routers and switches have different techniques for password recovery, so the following discussion is limited to the 2500 series. If you need to do this for another model, do a quick search engine check for "password recovery cisco" and you should quickly find a document for the Cisco router you're working with.

    For the 2500 series, you start by reloading the router and sending a BREAK signal during the first 60 seconds of the reload. Depending on the terminal program you're using, this can be the hardest part of the entire process! For most, just press CTRL-BREAK during this

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    of recovery!

    Obviously, that can make you pretty nervous about changing the config register, CCNA or not. Different Cisco routers and switches have different techniques for password recovery, so the following discussion is limited to the 2500 series. If you need to do this for another model, do a quick search engine check for "password recovery cisco" and you should quickly find a document for the Cisco router you're working with.

    For the 2500 series, you start by reloading the router and sending a BREAK signal during the first 60 seconds of the reload. Depending on the terminal program you're using, this can be the hardest part of the entire process! For most, just press CTRL-BREAK during this

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    o the 2500 series. If you need to do this for another model, do a quick search engine check for "password recovery cisco" and you should quickly find a document for the Cisco router you're working with.

    For the 2500 series, you start by reloading the router and sending a BREAK signal during the first 60 seconds of the reload. Depending on the terminal program you're using, this can be the hardest part of the entire process! For most, just press CTRL-BREAK during this

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    by reloading the router and sending a BREAK signal during the first 60 seconds of the reload. Depending on the terminal program you're using, this can be the hardest part of the entire process! For most, just press CTRL-BREAK during this one-minute period. If this doesn't work, you may need to check Help in your terminal program to find out how to send this break signal.

    As a result of the break sequence, the router will go into ROM Monitor mode. The commands here are totally different than the ones you're used to working with in the router's IOS. Use the command o/r 0x2142 to change the config register setting, and reload the router by entering the letter "i".

    This config register setting doesn't erase anything, but it does make the router ignore the contents of NVRAM. This means that you'll be prompted to go into the dreaded Setup Mode, which you do NOT want to do. Simply press "N" and type "enable" when you're at the router prompt. (If you do go into Setup Mode, you can always get out with CTRL-C, a handy command to know for the CCNA exam and for real life, as you can see!)

    Be very careful with the next step. You want to enter the command "configure memory

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