Updating schedule information retrieving busy information from the server

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During an interactive domain logon, the domain controller authenticates the user by verifying the user’s identity, and also provides authorization data for the user’s access token by determining all groups of which the user is a member.

Because the global catalog is the forestwide location of the membership of all universal groups, access to a global catalog server is a requirement for authentication in a multidomain forest.

A global catalog server is also required for applications such as Microsoft Exchange Server.

An ideal distribution of the global catalog is to have at least one global catalog server in each AD DS site.

When a global catalog server is available in a site, the authenticating domain controller is not required to communicate across a WAN link to retrieve global catalog information.

It is recommended make all domain controllers be global catalog servers.

Updated: November 19, 2014Applies To: Windows Server 2003, Windows Server 2003 R2, Windows Server 2003 with SP1, Windows Server 2003 with SP2, Windows Server 2008, Windows Server 2008 R2, Windows Server 2012, Windows Server 2012 R2 In a multidomain Active Directory® Domain Services (AD DS) forest, the global catalog provides a central repository of domain information for the forest by storing partial replicas of all domain directory partitions.

These partial replicas are distributed by multimaster replication to all global catalog servers in a forest.

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