Correct Answer: Verify DNS resolution, time synchronization, and connectivity between ISE and the domain controllers, and confirm the join operation actually completed successfully
Explanation: Checking DNS, time sync, connectivity, and join status are the standard first troubleshooting steps for AD authentication failures, unlike reinstalling ISE from scratch, wrongly blaming TACACS+, disabling authorization policies, randomly renaming the node, or contacting only the switch vendor without ISE-side investigation.
Correct Answer: Verify DNS resolution, time synchronization, and connectivity between ISE and the domain controllers, and confirm the join operation actually completed successfully
Explanation: Checking DNS, time sync, connectivity, and join status are the standard first troubleshooting steps for AD authentication failures, unlike reinstalling ISE from scratch, wrongly blaming TACACS+, disabling authorization policies, randomly renaming the node, or contacting only the switch vendor without ISE-side investigation.