Explanation/Reference:
Explanation:
Information in the ListOfDDCs and ListOfSIDs can come from several places in a deployment. The VDA checks the following locations, in order, stopping at the first place it finds the lists:
1.A persistent storage location maintained for the auto-update feature. This location contains Controller information when auto-update is enabled and after the VDA successfully registers for the first time after installation. (This storage also holds machine policy information, which ensures that policy settings are retained across restarts.) For its initial registration after installation, or when auto-update is disabled, the VDA checks the following locations.
2.Policy settings (Controllers, Controller SIDs).
3.The Controller information under the Virtual Desktop Agent key in the registry. The VDA installer initially populates these values, based on Controller information you specify when installing the VDA.
4.OU-based Controller discovery. This is a legacy method maintained for backward compatibility.
5.The Personality.ini file created by Machine Creation Services.
Reference: https://docs.citrix.com/en-us/xenapp-and-xendesktop/7-8/manage-deployment/delivery- controllers.html