11. Step B3: Determine Global Catalog Placement
Global catalog services facilitate the lookup of information to all domains in the forest, specifically to domains outside of the current domain. The catalog is a subset of information from each domain that is replicated to every global catalog server in the forest. Applications such as Exchange Server rely heavily on the global catalog for relevant information. The global catalog is also used during the logon process to enumerate universal group memberships.
All global catalog services physically reside on one or more domain controllers. There is no way to separate global catalog functionality from a domain controller.
The decision needs to be made as to which domain controllers in the forest ...
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