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Administrative access to console, vty, and AUX lines and to HTTP access can be authenticated locally using the following:
A more scalable method is to use a server-based solution using one of the following methods:
Authentication, authorization, and accounting (AAA) is a standards-based framework that you can implement to control who is permitted to access a network (authenticate), what they can do while they are there (authorize), and audit what actions they performed while accessing the network (accounting).