Question 90
During an 802.1X, portal, or device administration test, engineers notice: A visitor's contract is terminated early but their sponsored guest account remains within its ordinary validity period and the security team must end access immediately. Which technical limitation best explains this behavior?
Explanation
Correct Answer
The underlying principle is: A future expiration timestamp alone does not terminate an already authorized guest session; disabling or revoking account access must be reflected on the NAD. Address this by: Disable the visitor identity and apply a supported session termination or reauthorization process for active access sessions. The confirming operational observation is: The visitor's old credentials no longer authenticate and an existing guest session loses access without waiting for the original expiry.
Incorrect Answers
ISE must return a network device-compatible RADIUS result, and the controller must map that result into the correct guest authorization behavior. “Review the controller platform's supported redirection and final ACL or VLAN attributes and align ISE authorization profiles accordingly” would remedy that alternative situation, but it would not correct the present issue: a future expiration timestamp alone does not terminate an already authorized guest session; disabling or revoking account access must be reflected on the NAD.
“Assign a guest-only authorization result using a dedicated guest VLAN and effective ACL or equivalent network enforcement” is the supported response when successful portal login authenticates the visitor but does not inherently restrict the final authorization profile to public Internet destinations. Here the decisive response is “Disable the visitor identity and apply a supported session termination or reauthorization process for active access sessions”, so that different intervention does not meet the stated requirement.
Portal authentication uses the identity source or source sequence selected for that portal, which can be separate from corporate employee authentication policies. “Set the guest portal authentication source to the intended internal or approved external guest identity store and leave employee authentication on its own policy” applies to that other condition. The reported evidence is a visitor's contract is terminated early but their sponsored guest account remains within its ordinary validity period and the security team must end access immediately; this alternative would address the wrong dependency.