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Deploying on-premises domain controllers begins with analyzing your forest and domain topology requirements. This analysis determines the optimal physical placement of domain controllers to ensure that clients in different locations can authenticate quickly and reliably. The Active Directory Domain Services (AD DS) role can be installed using either Server Manager or PowerShell, giving administrators flexibility based on their automation preferences. Both tools support the full installation and configuration process, including promoting a server to a domain controller and specifying the domain or forest that it will join.
Every domain controller needs reliable name resolution, and the tight integration of DNS with Active Directory is a key part of the design. By configuring integrated DNS zones, the domain controller stores DNS zone data directly in the directory database. This design means that zone information replicates automatically alongside other AD DS data, reducing administrative overhead and improving fault tolerance. Replication scopes control how directory changes flow between domain controllers. Administrators must configure these scopes carefully, because they determine which domain controllers receive updates from which others and how quickly changes propagate across a large site topology.
Applying security baselines to domain controllers helps protect the directory service from attackers who might try to compromise authentication or directory data. These baselines include settings for account policies, audit policies, and restrictions on who can log on to domain controllers directly. Site-aware best practices focus on designing Active Directory sites that match the physical network topology. This involves creating site links, assigning costs to those links, and placing domain controllers close to the users and resources they serve. When a domain controller is placed in the same site as its clients, authentication traffic stays on the local network and does not cross slower wide-area links, which improves performance and availability. Following these practices ensures that the on-premises domain controller infrastructure remains robust and supports both traditional on-premises workloads and hybrid scenarios that connect to Azure.
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