What does the LAP send when multiple WLCs respond to the CISCO-CAPWAP-CONTROLLER.localdomain hostname during the CAPWAP discovery and join process?
A. unicast discovery request to the first WLC that resolves the domain name
B. broadcast discovery request
C. join request to all the WLCs
D. unicast discovery request to each WLC
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Answer is D.
The Lightweight AP (LAP) can discover controllers through your domain name server (DNS). For the access point (AP) to do so, you must configure your DNS to return controller IP addresses in response to CISCO-LWAPP-CONTROLLER.localdomain, where localdomain is the AP domain name. When an AP receives an IP address and DNS information from a DHCP server, it contacts the DNS to resolve CISCO-CAPWAP-CONTROLLER.localdomain. When the
DNS sends a list of controller IP addresses, the AP sends discovery requests to the controllers.
############## 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 Message to the resolved IP address(es). Each WLC that receives the CAPWAP Discovery Request Message replies with a unicast CAPWAP Discovery Response to the AP. ################
The next section describes how to configure the Microsoft Windows 2016 server for WLC discovery.
The answer is D. Below states this.
https://www.cisco.com/c/en/us/support/docs/wireless/4400-series-wireless-lan-controllers/107606-dns-wlc-config.html#anc5
I think is D.
Because when the DNS sends the ip address to the LAPs, this ones send a unicast to all WLCs.