If R1 authenticates the user, it issues a PASS response to the network access server and the user is allowed to access the network. If R1 returns a FAIL response, the user is denied access and the session is terminated. This pattern would continue through the remaining designated methods until the user is either authenticated or rejected, or until the session is terminated. If all of the authentication methods return errors, which the network access server would process as a failure, the session would be terminated. A FAIL means that the user has not met the criteria contained in the applicable authentication database to be successfully authenticated.
Authentication ends with a FAIL response.
Because of this, no authentication has been attempted. Where to Begin You must first decide what kind of security solution you want to implement. You need to assess the security risks in your particular network and decide on the appropriate means to prevent unauthorized entry and attack. We recommend that you use AAA, no matter how minor your security needs might be. Enable AAA by using the aaa new-model global configuration command.