Configure Password Settings on a Switch through the Command Line Interface (CLI) - Cisco
Setting up a Cisco DPC3827 Router
Configuring Local Username Database in Cisco IOS – Router Switch Blog
How do I configure a Cisco router for secure remote access using SSH? – O'Reilly
Cisco Router 'Privileged' Mode
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Cisco 4000 Series ISRs Software Configuration Guide, Cisco IOS XE Gibraltar 16.12.x - Managing the Device Using Web User Interface [Cisco 4000 Series Integrated Services Routers] - Cisco