I use several videos to instruct my class on how to do various task on configuring Windows servers after we go through the videos and discuss what we have seen. I work with the students in groups of three to do the task on virtual servers, the ones whom do good or outstanding and have a good grasp of the material I have them assist the others whom maybe a little less adaptive to the new material. The students seem to love this approach.
Source: Microsoft Windows Server 2008
There are two default groups created when you raise a member server to a domain controller, these groups are Organizational Units(OU) that are created automatically, one is the Domain Group the other is the Domain Controller OU
Source: Windows Server 2008 70-640 Class