From which DNS record can a Cisco wireless AP, running Cisco WLC version 6.0 or later, retrieve bootstrap information?
A. cisco-capwap-controller
B. the DNS A record of the controller hostname
C. the DHCP Option 43 name
D. cisco-lwapp-controller
Which DNS record can a Cisco wireless AP, running Cisco WLC version 6.0 or later, retrieve bootstrap information?
The AP will attempt to resolve the DNS name “CISCO-CAPWAP-CONTROLLER.localdomain”. When the AP is able to resolve this name to one or more IP addresses, the AP sends a unicast CAPWAP Discovery Request to the resolved IP address(es). The DNS entries can be either an A (address) or CNAME (alias) records.
If the AP received a DHCP address, ensure the DHCP server is configured to return valid DNS servers and a valid domain name suffix to the AP.
If the AP is using a static IP address, configure the domain name and DNS name servers from the controller. WLC version 4.2 requires configuration from the CLI, whereas 6.0 and later allow configuration from the GUI. Once applied, the AP will disconnect and re-join the controller.
http://www.revolutionwifi.net/revolutionwifi/2010/11/capwap-controller-discovery-process_23.html