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Lesson 5 Add a domain controller to an existing domain
Objective Add a domain controller to a domain.

Add Domain Controller to an Existing Domain in Active Directory

You learned earlier that a domain controller is a Windows 2000 Server computer, which contains a copy of Active Directory for the domain and authenticates user logons. One or more domain controllers exist in each Windows 2000 domain. Creating a domain automatically creates the first domain controller for that domain.
After you create a domain, you should create an additional domain controller in the domain. In fact, Microsoft recommends that every domain have at least two domain controllers. Why? To provide fault tolerance and provide load balancing for Active Directory.

How to add a Domain Controller

You begin the process of adding a domain controller to an existing domain in the same way that you begin the process of creating a root domain: Run Dcpromo.exe to start the Active Directory Installation Wizard.
The remaining steps for this process are outlined below:
  1. Click Additional domain controller for an existing domain. Specify the username, password, and domain name of a user account that has rights to create domain controllers in Active Directory, as shown here:

This shows the wizard box where you choose to create a domain controller
  1. After you have typed in this information, the wizard will carry you through the installation process. You'll need to specify the following information:
    1. The DNS name of the existing domain for which this computer will become an additional domain controller
    2. The locations for the Active Directory database and log files
    3. The location for the shared system volume
  1. After you finish specifying the installation information, the Active Directory Installation Wizard converts the computer to a domain controller, replicates Active Directory from an existing domain controller, converts the computer to a domain controller, and adds the Active Directory consoles discussed in the previous module to the Administrative Tools menu on that computer.
In the next lesson, you will learn how to create a child domain.