In which scenario is an AP most likely to utilize a DNS query during discovery?

An access point (AP) is most likely to utilize a DNS query during the discovery process when it cannot successfully find its controller or other necessary services through the standard methods, such as DHCP options or local broadcast. When all other methods fail, the AP may revert to using DNS to resolve the fully qualified domain name (FQDN) of its controller or the destination server. This allows the AP to continue trying to establish a connection and ensures it can locate its management point even when other methods are unavailable.

The other scenarios presented do not accurately reflect when a DNS query would be employed. During boot-up, an AP primarily utilizes information it receives from DHCP or static configuration rather than immediately invoking DNS queries. Dynamic FQLN configuration refers to the method of accessing dynamic DNS records, but that process usually occurs after the AP has acquired its initial settings, not as a primary discovery method. Firmware updates generally use established connectivity and protocols already known to the AP instead of initiating a DNS query specifically for that task.