A read-only domain controller (RODC) is a server that hosts an Active Directory database's read-only partitions and responds to security authentication requests.
RODC, which was designed to be used in branch offices that cannot support their own domain controllers, can be used in a Windows Server 2008 environment or higher.
Before installing RODCs, Microsoft recommends that organizations meet some prerequisites to ensure they work properly, including having a functional AD forest level set at Windows Server 2003 or higher and at least one writeable domain controller deployed on Windows Server 2008 or higher.
This was last updated in January 2014
Continue Reading About RODC (read-only domain controller)
Dig Deeper on IT operations and infrastructure management