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Description:
Starting with Windows Server 2003, a new feature called Universal Group Membership Caching (UGMC) caches a user’s membership in Universal Groups on domain controllers authenticating the user. This feature allows a domain controller to have knowledge of Universal Groups a user is member of rather than contacting a Global Catalog.
Unlike Global group memberships, which are stored in each domain, Universal Group memberships are only stored in a Global Catalog. For example, when a user who belongs to a Universal Group logs on to a domain that is set to the Windows 2000 native domain functional level or higher, the Global Catalog provides Universal Group membership information for the user’s account at the time the user logs on to the domain to the authenticating domain controller.
UGMC is generally a good idea for multiple domain forests when:
1. Universal Group membership does not change frequently.
2. Low WAN bandwidth between Domain Controllers in different sites.
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