Saw other posts about this...

If you replicate a DC (by whatever method) - make sure it has DNS on it...and 
after it is in the isolated environment, seize all the roles.

If you can't make a 'snap shot' of an existing DC (using whatever method you 
prefer) then you can always fall back to the tried-and-true method (I've done 
these high-level steps with physical hardware {desktop's running server OS} and 
virtual technology):

Build the server OS (make sure it has DNS on it!)
Promote it to become a DC
Mark is as a global catalog server
Let it replicate all the data (AD/SYSVOL/GC data)
Take it off the production network
Clean up production (metadata cleanup - see technet articles)

In the ISOLATED environment (NEVER ever let it come back into production - use 
separate, physical network gear!):

Boot the OS
Logon (using the administrator account)
Configure the IP address as appropriate
Point it to itself for DNS
Reboot
Seize all the FSMO roles


Good luck!

-----Original Message-----
From: Ian Roche [mailto:[email protected]]
Sent: Wednesday, January 28, 2009 4:22 AM
To: Active Directory Admin Issues
Subject: Copy of the production Active Directory from a live DC to a tes DC


Just wondering if anyone has any tips for this one before I do it. Lots on the 
web about it was looking at following the link below. If its the way to go let 
me know. All I want to do is to get a test domain controller up and running on 
a segregated network as one of our departments in hear need to test application 
changes which uses LDAP authentication .

http://www.pbbergs.com/windows/articles/TestDomain.html
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