For access to router / switch using Telnet we use the Virtual Teletype (VTY) lines. To protect VTY port from unwanted access, we must configure password on this port. Also, if password is not configured and enabled, Telnet access will not be possible.
Adding password to console port
There is only one console port on all routers / switches, so the mark is console 0. To protect console port from unwanted access, we must configure password on this port:
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