Question 80
An administrator reviewing a Cisco ISE deployment identifies: A corporate employee's 802.1X credentials fail only on one newly deployed ISE PSN even though the same account works on the established node and directory controllers are healthy. What ongoing control should operations standardize for this scenario?
Explanation
Correct Answer
This safeguard directly addresses active directory join for identity lookup: Monitor AD join status separately on relevant ISE nodes and verify directory connectivity after site or firewall migrations. The risk being prevented is: ISE nodes require a functioning relationship to the intended Active Directory identity source, including reachability, name resolution, and a healthy domain join. A safeguard aimed at another fault would not control this issue.
Incorrect Answers
Identity source sequences control where ISE looks up a principal and how defined source selection and not-found behavior are handled. “Test duplicate usernames and identity-store selection after adding or changing local and external identity providers” would remedy that alternative situation, but it would not correct the present issue: ISE nodes require a functioning relationship to the intended Active Directory identity source, including reachability, name resolution, and a healthy domain join.
“Rotate LDAP service credentials safely and monitor certificate and directory schema changes that might invalidate lookups” is the supported response when an LDAP identity store requires a supported connection and bind configuration, appropriate directory credentials, and trust for encrypted transport where configured. Here the decisive response is “Monitor AD join status separately on relevant ISE nodes and verify directory connectivity after site or firewall migrations”, so that different intervention does not meet the stated requirement.
PEAP inner credential authentication and EAP-TLS certificate authentication are different method flows, and an allowed protocol set must match the approved supplicants. “Track permitted EAP methods by device cohort and remove deprecated methods only after compatible supplicants are deployed” applies to that other condition. The reported evidence is a corporate employee's 802.1X credentials fail only on one newly deployed ISE PSN even though the same account works on the established node and directory controllers are healthy; this alternative would address the wrong dependency.