GDS Server Samples-How GDS pulls the AliasName from Registered servers.|OPC UA Implementation: Stacks, Tools, and Samples|Forum|OPC Foundation

When a Server registers with the GDS, the GDS shall merge the AliasNames of the registering
Server into a master AliasNames list on the GDS. For this GDS has to Connect to Server to fetch the Alias, I have a doubt ,using what Authentication Mode ( Anonymous ,username or Certificate )GDS connects with Server and also how GDS gets the Authentication parameters , as Initial Server Registration does not have those details.

Could you please provide some insight on this.

Thank you.