Question 400
During a planned service expansion at Prairie Health Network, engineers say that they resolved this finding: A network device accepts local login but never reaches the configured TACACS+ server during administrator authentication. Which result provides the STRONGEST acceptance evidence?
Explanation
Correct Answer
A test administrator authenticates through TACACS+ and the server logs the transaction. This is the decisive evidence for the original problem: A network device accepts local login but never reaches the configured TACACS+ server during administrator authentication. It verifies that the intended corrective control—Verify AAA server reachability, source interface, shared secret, and method-list order—works in the relevant environment; a completed change ticket alone would not prove the outcome at Prairie Health Network.
Incorrect Answers
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 Prairie Health Network was resolved. The specific required evidence is: A test administrator authenticates through TACACS+ and the server logs the transaction.
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 Prairie Health Network was resolved. The specific required evidence is: A test administrator authenticates through TACACS+ and the server logs the transaction.
The corrected matching policy grants only the authorized access type. This would be relevant evidence for a different failure: AAA debug logs show an unknown policy set and engineers incorrectly change user passwords, usually addressed by Correlate identity, network device group, service, and policy evaluation before changing credentials. It does not demonstrate that the current problem at Prairie Health Network was resolved. The specific required evidence is: A test administrator authenticates through TACACS+ and the server logs the transaction.