Question 410
At Elmwood Manufacturing, a team reports that it corrected the following problem affecting industrial analytics and business systems: A network device sends TACACS+ requests from an interface not permitted through the management firewall. Which observation BEST verifies that the correction actually worked?
Explanation
Correct Answer
Requests reach the intended AAA server from the approved source address. This is the decisive evidence for the original problem: A network device sends TACACS+ requests from an interface not permitted through the management firewall. It verifies that the intended corrective control—Configure an appropriate source interface and allow the required AAA flow securely—works in the relevant environment; a completed change ticket alone would not prove the outcome at Elmwood Manufacturing.
Incorrect Answers
An approved identity receives the correct VLAN or authorization profile. This would be relevant evidence for a different failure: RADIUS authentication succeeds but an access policy applies the wrong authorization attributes, usually addressed by Inspect the returned RADIUS attributes and the corresponding device policy mapping. It does not demonstrate that the current problem at Elmwood Manufacturing was resolved. The specific required evidence is: Requests reach the intended AAA server from the approved source address.
Authorized emergency access works during outage and produces an audit trail. This would be relevant evidence for a different failure: A firewall times out to its AAA server and administrators become locked out without a documented recovery method, usually addressed by Configure a carefully restricted local break-glass fallback and test server failure behavior. It does not demonstrate that the current problem at Elmwood Manufacturing was resolved. The specific required evidence is: Requests reach the intended AAA server from the approved source address.
A test administrator authenticates through TACACS+ and the server logs the transaction. This would be relevant evidence for a different failure: A network device accepts local login but never reaches the configured TACACS+ server during administrator authentication, usually addressed by Verify AAA server reachability, source interface, shared secret, and method-list order. It does not demonstrate that the current problem at Elmwood Manufacturing was resolved. The specific required evidence is: Requests reach the intended AAA server from the approved source address.