I have two sites and plan to perform an inter-site replication between two domain controllers. Do I need to assign a single master operation on the additional domain controller for fault tolerance if one goes down or is only one Global Catalog required?
You should configure a minimum of two domain controllers in each domain, and at least one per site. If you are in a single-domain environment, I recommend configuring all domain controllers as Global Catelogs, as this has no replication impact in a single-domain environment.
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