Interduction:
All exercises are based on the “Cisco Packet Tracer” software platform.
Command line reset router:

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Enter privilege (enable) mode.
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Clear the configuration file (i.e.
startup-config) in NVRAM.
Erasing the nvram filesystem will remove all configuration files! Continue? [confirm]
Press enter to confirm deletion.
Erase of nvram: complete
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Proceed with reload? [confirm]
Press enter to confirm device restart.

At this point, the router has been reset to the default login screen.
