Administering Windows Server Hybrid Core Infrastructure (AZ-800) Practice

Which of the following is a common practice when managing DNS in Azure?

1. Only use private DNS zones.

2. Configure DNS zones based on geographic location.

3. Implement split-horizon DNS when necessary.

4. Never use public DNS zones due to security risks.

The correct answer is: Implement split-horizon DNS when necessary.

The practice of implementing split-horizon DNS when necessary is a common strategy in managing DNS within Azure environments. Split-horizon DNS is used to serve different DNS records based on the source of the DNS query — essentially allowing the same domain name to resolve to different IP addresses depending on whether the request is coming from inside or outside the network. This approach is particularly useful for organizations that need to provide different services to internal users as opposed to external clients, enhancing both security and user experience. For example, an organization might route internal traffic to an internal resource that is not exposed to the public internet, while external users accessing the same domain can reach a public-facing application. Utilizing split-horizon DNS allows seamless management of internal and external traffic, thus optimizing resource accessibility and maintaining security protocols. While other options may seem viable in certain contexts, implementing split-horizon DNS specifically addresses the need for differentiated services based on the request origin, making it a common and effective practice in cloud environments like Azure.