and press Enter. Doing so starts the Active Directory Domain Services Installation wizard. In the Additional Domain Controller Options dialog box, select the “Read-only domain controller (RODC)” option, as shown below.
When you select the RODC option, the system will prompt you to enter the group or users you want to have local administrator permissions. This RODC designation won’t give those groups or users any privileges on the writable DCs. The dialog box is shown below.
If you perform an advanced-mode promotion, you can also configure the initial password- replication policy. Otherwise, you can configure the policy later.