Why would an AP that successfully discovers a WLAN controller be denied from joining that WLC?

Why would an AP that successfully discovers a WLAN controller be denied from joining that WLC?

• The name of the WLC is different from the pre-configured name on the Cisco lightweight AP.
• The WLC already has the maximum number of APs joined to it.
• The WLC has a software release downloaded on it that is different from the lightweight AP software.
• The WLC is configured to be the standby WLC in an SSO group.

Explanation: A WLC will deny an AP from joining it if the maximum number of lightweight APs already joined to it has already been reached.

Exam with this question: CCNP Core Networking: Modules 17 - 19 Checkpoint Exam: Wireless Essentials Exam