Configure a Forest or a Domain
To implement an Active directory infrastructure in your organization, you need a proper planning that includes creating a forest plan, domain plan, organizational unit plan, and a site topology. After, you have your AD infrastructure plan ready with a domain structure, domain name, storage location of database log files, location of shared system folder, DNS configuration, you can continue with configuring your first domain controller that will implement Active Directory in your domain/forest.
The first domain controller that you install in your organization becomes the first forest root, first domain tree, first domain, and first site installed on your network. You can install Active Directory in your network in a number of ways. You can use Active Directory Installation Wizard to install Active Directory, an Answer File to Perform an Unattended Installation, Using a Network or Backup Media, and using the ‘Configure Your Server’ Wizard to install Active Directory.