Are there any special considerations? To deploy an RODC, at least one writable domain controller in the domain must be running Windows Server 2008. In addition, the functional level for the domain and forest must be Windows Server 2003 or higher.
RODC filtered attribute set Some applications that use AD DS as a data store might have credential-like data (such as passwords, credentials, or encryption keys) that you do not want to be stored on an RODC in case the RODC is compromised. For these types of applications, you can dynamically configure a set of attributes in the schema for domain objects that will not replicate to an RODC. This set of attributes is called the RODC filtered attribute set. Attributes that are defined in the RODC filtered attribute set are not allowed to replicate to any RODCs in the forest. A malicious user who compromises an RODC can attempt to configure it in such a way that it tries to replicate attributes that are defined in the RODC filtered attribute set. If the RODC tries to replicate those attributes from a domain controller that is running Windows Server 2008, the replication request is denied. However, if the RODC tries to replicate those attributes from a domain controller that is running Windows Server 2003, the replication request can succeed. Therefore, as a security precaution, ensure that forest functional level is Windows Server 2008 if you plan to configure the RODC filtered attribute set. When the forest functional level is Windows Server 2008, an RODC that is compromised cannot be exploited in this manner because domain controllers that are running Windows Server 2003 are not allowed in the forest.
