I was looking at the Additional Configurations video in the Azure Virtual Desktop course and at 12 minutes 30 seconds it talks about using keeping the Azure DNS server as a secondary server to route to Azure resources but that doesn't seem to be accurate with how DNS works in Windows. The client only hits the primary server as long as it is online and if it doesn't have the record then it sends it to the forwarders configured in DNS. It looks like a DNS proxy is deployed in proxy and is used to forward the requests to in Azure based on the following Microsoft doc:
My question is what all would this be used for? Would it be used for faster connections to OneDrive/Teams/Sharepoint Online and is there a way to test this as far as seeing performance improvements before/after?
I see different things in the docs about it being used for machine learning, Azure SQL server, and Web Apps.
We have a DC with DNS in Azure with a firewall using a site to site VPN to on prem. Our primary DNS setting in Azure is our DC in Azure and the secondary is our primary DNS server at our primary site.