Although it??™s not a hard-and-fast rule that every domain controller in your domain
must be running the same operating system, it??™s the ideal scenario to reduce the possibility
for replication or compatibility issues. The operating systems that your domain controllers
can run when participating in the domain are limited by your domain functional
level. Once all your domain controllers have been upgraded to Windows Server 2008
and you are sure that no legacy domain controllers will be participating in your domain,
you should raise the domain functional level to Windows Server 2008 to be able to use
all the new features. If you want to deploy RODCs in your domain, you will minimally
need to ensure that you have at least one Windows Server 2008 domain controller and
that it is running the PDC Emulator role.
NOTE I wish I could include a more step-by-step checklist on the right way to perform a migration.
In the real world, each company and each environment presents different and unique challenges
that ultimately drive these design decisions. If you already have Active Directory in place and have
planned out your Active Directory infrastructure, all that remains for you is to determine if and where
RODCs belong and whether or not a Server Core installation is right for your organization.
CHAPTER SUMMARY
This chapter offers a lot of important content. Active Directory is one of the most critical
pieces??”if not the most critical piece??”of infrastructure in a Windows-based network.
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