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If you already have one domain controller in a domain, you can add additional domain controllers to the domain to improve the availability and reliability of network services. Adding additional domain controllers can help provide fault tolerance, balance the load of existing domain controllers, and provide additional infrastructure support to sites.
More than one domain controller in a domain makes it possible for the domain to continue to function if a domain controller fails or must be disconnected. Multiple domain controllers can also improve performance by making it easier for clients to connect to a domain controller when logging on to the network. You can add additional domain controllers over the network or from backup media.
Before adding domain controllers you should thoroughly understand Active Directory and the requirements necessary to set up additional domain controllers in an existing domain. For more information, see Checklist: Creating an additional domain controller in an existing domain and Create an additional domain controller.
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