Domain Roles
The schema master and the domain naming master are forest-wide roles. This means that no matter how many or how few domains you have, you still have only one each of these operations masters. The next (and last) three operations masters we will look at are specific to the domain. If you have one domain, you have one each of the infrastructure master, PDC emulator, and RID master. If you have 10 domains, you have 10 each of the infrastructure master, PDC emulator, and RID master. There is always one per domain.
These roles can all be one machine and, by default, are located on the first Domain Controller in the domain. However, as we will see in the next sections, moving them to different machines is wise unless you have a very small ...
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