One of the most exciting technologies coming in Windows Server 2008 is improved Active Directory domain controller security features. Called read-only domain controller (RODC), this new domain controller technology includes a number of features aimed at improving overall security of the Active Directory environment at branch locations.
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One way in which the RODC improves the security of your AD environment is by providing a read-only copy of the Active Directory database. This means that no one -- user or administrator -- can make changes to the Active Directory database from a read-only domain controller.
You can connect to an RODC to read almost all of the same information just as you can from a writeable DC, but you will not be able to perform any write operations without connecting to a writeable DC using Remote Desktop. Or, you could update Active Directory by connecting to a writeable DC using an MMC snap-in, script or command-line tool.Read the entire article at SearchWinIT.com