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For example, the DNS domain name registered to Microsoft () is known as a second-level domain.This is because the name has two parts (known as labels) that indicate it is located two levels below the root or top of the tree.
Most DNS discussions, however, identify names in one of five ways, based on the level and the way a name is commonly used.
In this environment, DNS namespaces mirror the Active Directory forests and domains used by an organization.
Network hosts and services are configured with DNS names so that they can be located in the network, and they are also configured with DNS servers that resolve the names of Active Directory domain controllers.
The next figure shows an example of a DNS tree with a host called mydomain within the The FQDN for the host would be mydomain.The DNS domain namespace, as shown in the following figure, is based on the concept of a tree of named domains.
Each level of the tree can represent either a branch or a leaf of the tree.