2.2. Name Resolution
What happens when your application calls database.internal.contoso.com? Somewhere, that name must become an IP address. DNS transforms human-readable names into IP addresses—and in Azure, choosing the right DNS option impacts performance, security, and hybrid connectivity.
đź’ˇ First Principle: DNS is the first step in every connection. If DNS fails, nothing works. If DNS is slow, everything feels slow. If DNS is public, your private resources are discoverable.
What breaks without proper DNS: Applications can't find services. Private Endpoints don't resolve correctly. Hybrid workloads can't discover on-premises resources. Troubleshooting becomes guesswork—you can't even confirm whether the problem is DNS or networking.
Think of DNS like a phone directory. You need the right directory for internal vs. external numbers. Azure DNS (public zones) is the public phone book. Private DNS zones are your internal company directory. DNS Private Resolver connects these directories to your on-premises systems.
