Essentially, the
functional level dictates the lowest common denominator supported by Active Directory.
To get all the features available in the Windows Server 2008 functional level, you
will need to make sure all your domain controllers are running Windows Server 2008.
Forests support four functional levels: Windows 2000, Windows Server 2003 interim,
Windows Server 2003, and Windows Server 2008. Similar to domain functional levels,
forest functional levels restrict features supported by the forest to those supported by
that specific functional level. To get the most features out of your current setup, you will
need to raise the forest functional level to the latest version.
WINDOWS SERVER 2008 ACTIVE
DIRECTORY DOMAIN SERVICES
If you were patient enough to read through the entire ???Active Directory Primer??? section,
congratulations! Entire books or even volumes of books could be written about Active
Directory, but the purpose of the primer in this chapter is to make sure we??™re all speaking
the same language and understanding the same basic concepts. Now you??™ve reached the
juicy parts: The remainder of this chapter will focus on the new features of Active Directory
in Windows Server 2008 as well as several migration scenarios.
Active Directory Requirements
Installing Active Directory, though quite painless, requires a bit of careful planning.
Assuming you have planned how you are going to configure your Active Directory forest
and domain, the following prerequisites should be in place before installing a Windows
Server 2008 Active Directory:
?–? Your server must be running the Windows Server 2008 operating system.
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