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A domain controller is a server running the Active Directory Domain Services (AD DS) role. It authenticates and authorizes all users and computers in a Windows domain-type network, assigning and enforcing security policies for all computers and installing or updating software.
The software and operating system used to run a domain controller usually consists of several key components shared across platforms.This includes the operating system (usually Windows Server or Linux), an LDAP service (Red Hat Directory Server, etc.), a network time service (ntpd, chrony, etc.), and a computer network authentication protocol (usually Kerberos). [4]
On Microsoft Servers, a domain controller (DC) is a server computer [1] [2] that responds to security authentication requests (logging in, etc.) within a Windows domain. [3] [4] A domain is a concept introduced in Windows NT whereby a user may be granted access to a number of computer resources with the use of a single username and password combination.
Authentication takes place on domain controllers. Each person who uses computers within a domain receives a unique user account that can then be assigned access to resources within the domain. Starting with Windows Server 2000, Active Directory is the Windows component in charge of maintaining that central database. [1]
By default, ADM files are stored in each GPO, within Sysvol on domain controllers. This creates a simple and effective model for replicating ADM files across domain controllers (which is handled by the File Replication Service). However, in some instances this can cause operational issues.
By default, the Active Directory Domain Service contains the following naming contexts: Schema NC: stores schema information that is replicated to domain controllers in all domains of the forest. Configuration NC: stores topology and other configuration data information that is replicated to domain controllers in all domains of the forest.
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Within Active Directory, objects that are updated on one Domain Controller are then replicated to other domain controllers through multi-master replication. It is not required for all domain controllers to replicate with each other as this would cause excessive network traffic in large Active Directory deployments.