This is a video about how to install a Read Only Domain Controller (RODC). A RODC stores a copy of Active Directory in a branch office. It will cache authentication credentials in an effort to reduce WAN (wide area network) traffic or bandwidth. You may control who may approve or deny who may or may not cache their credentials (passwords) on the RODC. It is a feature available on Microsoft Windows Server 2008 only and requires a server 2003 functional domain. Any machine running Server 2003 must have a command (adprep /rodcPrep) run on them to prepare them for a domain or forest that contains a read only domain controller.

Commands used:
dcpromo
d:supportadprepadprep /forestPrep
d:supportadprepadprep /rodcPrep

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windows server