70-294 Concepts: Where to place Global Catalogs

When designing a multi-site environment, here are the considerations you should take when deciding which sites require a Global Catalog:

Use a Global Catalog instead of Universal Group Membership when AD information is required by an application at another site
Uses more bandwidth compared to Universal Group Memberships
Requires greater computer resources compared to Universal Group Memberships
When you want to control Global Catalog replication, use the Preferred Bridgehead Server setting
IgnoreGCFailures registry key; apply to all DC to prevent GC failures from preventing logon

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