Refer to the exhibit. A network administrator configures AAA authentication on router R1. The ACS servers are configured and running. The administrator tests the configuration by telneting to R1. What will happen if the administrator attempts to authenticate through the RADIUS server using incorrect credentials?

Refer to the exhibit. A network administrator configures AAA authentication on router R1. The ACS servers are configured and running. The administrator tests the configuration by telneting to R1. What will happen if the administrator attempts to authenticate through the RADIUS server using incorrect credentials?

• The enable secret password and a random username could be used in the next login attempt.
• The authentication process stops.
• The enable secret password could be used in the next login attempt.
• The username and password of the local user database could be used in the next login attempt.

Explanation: The authentication for Telnet connections is defined by AAA method list AUTHEN. The AUTHEN list defines that the first authentication method is through an ACS server using the RADIUS protocol (or RADIUS server), the second authentication method is to use the local user database, and the third method is to use the enable password. In this scenario, however, because the administrator fails to pass the authentication by the first method, the authentication process stops and no other authentication methods are allowed.

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