| Define and apply the authentication method list. It consists of security profiles that specify either the protocol, ARAP or PPP, or the login and authentication method. The login and authentication method can be TACACS+, RADIUS, or Local Authentication. The authentication method is defined by the aaa authentication command. The protocol or login authentication should be specified, and a named list should be identified, if needed. Four alternate authentication methods may be set in the event the primary method is unavailable.