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How do you install an Read-Only Domain Controller----------(RODC)

1 Make sure you are a member of Domain Admin group
2. Ensure that the forest functional level is Windows Server 2003 or higher
3. Run adprep /rodcprep
3. Install a writable domain controller that runs Windows Server 2008 – An RODC must replicate domain updates from a writable domain controller that runs Windows Server 2008. Before you install an RODC, be sure to install a writable domain controller that runs Windows Server 2008 in the same domain. The domain controller can run either a full installation or a Server Core installation of Windows Server 2008. In Windows Server 2008, the writable domain controller does not have to hold the primary domain controller (PDC) emulator operations master role.
4. You can install an RODC on either a full installation of Windows Server 2008 or on a Server Core installation of Windows Server 2008. Follow the below steps:
§ Click Start, type dcpromo, and then press ENTER to start the Active Directory Domain Services Installation Wizard.
§ On the Choose a Deployment Configuration page, click Existing forest, click Add a domain controller to an existing domain
§ On the Network Credentials page, type the name of a domain in the forest where you plan to install the RODC. If necessary, also type a user name and password for a member of the Domain Admins group, and then click Next.
§ Select the domain for the RODC, and then click Next.
§ Click the Active Directory site for the RODC and click next
§ Select the Read-only domain controller check box, as shown in the following illustration. By default, the DNS server check box is also selected. To run the DNS server on the RODC, another domain controller running Windows Server 2008 must be running in the domain and hosting the DNS domain zone. An Active Directory–integrated zone on an RODC is always a read-only copy of the zone file. Updates are sent to a DNS server in a hub site instead of being made locally on the RODC.
§ To use the default folders that are specified for the Active Directory database, the log files, and SYSVOL, click Next.
§ Type and then confirm a Directory Services Restore Mode password, and then click Next.
§ Confirm the information that appears on the Summary page, and then click Next to start the AD DS installation. You can select the Reboot on completion check box to make the rest of the installation complete automatically.

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