DNS services in Azure
There are several DNS-related services and features in Azure. An overview of each is given in the following list. The first three items are Azure services, which you consume by creat- ing service-specific resources that you will be billed for. The remaining three items are Azure features, which you configure using settings on other resource types, such as a virtual network,public IP address, or network interface.
- Azure DNS Allows you to host your DNS domains in Azure. It provides the ability to create and manage the DNS records for your domain and provides name servers, which answer DNS queries for your domain from other users on the internet. Azure DNS also supports private DNS zones, which are used for intranet-based name resolution for VM to VM lookups, including support for some scenarios not supported by the Azure- provided DNS service, which will be covered shortly.
- Azure Traffic Manager An intelligent DNS service that uses DNS to implement global traffic management. Where Azure DNS always provides the same DNS response to any given DNS query, in Azure Traffic Manager the same query may result in one of several possible responses, depending on a number of factors you control, such as where the end-user is located or which of your service endpoints is currently available. This enables you to route traffic intelligently between Azure regions or between Azure deployments and on-premises deployments. Understanding Traffic Manager is beyond the scope of the AZ-104 exam.
- App Service Domains This service is used to purchase domain names, which can then be hosted in Azure DNS. This service is integrated with Azure App Service, but can be used for any domain registration, even if App Service is not being used.
- Azure-provided DNS Sometimes called Internal DNS, it allows the VMs in your virtual network to find each other, using DNS queries based on the hostname of each VM. The DNS queries are internal (private) to the virtual network.
- Recursive DNS A service provided by Azure for DNS name resolution from your Azure VMs or other Azure services. You can also configure your VMs to use your own DNS server instead. This is sometimes informally called “bring your own DNS.” This is common when joining your VMs to a domain controller.
- Reverse DNS Provides the ability to configure the reverse DNS lookup for an Azure- assigned public IP address. (Reverse DNS lookup zones for IP blocks you own can be hosted in Azure DNS.)