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Our only one existing dc is on a 2008 server. I just set up a new 2008 R2 and wanted to add it to this domain using dcpromo.exe. But I got an error saying I have to run adprep.exe /forestprep. Okay, it thought I just went ahead run it on the 2008 R2 but I got another error saying I have to run adprep.exe on a DC. &nbsp;Okay, then I have to run adprep.exe on the 2008 server as it is only one dc at this moment. But question to you, which version of adprep.exe should I use? Should I use the one from 2008 R2 or from the existing 2008 server's ? &nbsp;Please help.
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Our only one existing dc is on a 2008 server. I just set up a new 2008 R2 and wanted to add it to this domain using dcpromo.exe. But I got an error saying I have to run adprep.exe /forestprep. Okay, it thought I just went ahead run it on the 2008 R2 but I got another error saying I have to run adprep.exe on a DC.  Okay, then I have to run adprep.exe on the 2008 server as it is only one dc at this moment. But question to you, which version of adprep.exe should I use? Should I use the one from 2008 R2 or from the existing 2008 server's ?  Please help.

How to add one more DC to the existing 2008 domain/ forest?

Active Directory (AD) is a Microsoft brand for identity-related capabilities. In the on-premises world, Windows Server AD provides a set of identity capabilities and services, and is hugely popular (88% of Fortune 1000 and 95% of enterprises use AD). This topic includes all things Active Directory including DNS, Group Policy, DFS, troubleshooting, ADFS, and all other topics under the Microsoft AD and identity umbrella.

Active Directory

Windows Server 2008 and Windows Server 2008 R2, based on the Microsoft Vista codebase, is the last 32-bit server operating system released by Microsoft. It has a number of versions, including including Foundation, Standard, Enterprise, Datacenter, Web, HPC Server, Itanium and Storage; new features included server core installation and Hyper-V.