Active Directory Global Catalog

If we set up AD with a single Forest, single Tree and single domain what are the consequenses of not setting up a global catalog?
Tony_RhoadesAsked:
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AwinishConnect With a Mentor Commented:
Global catalog contains complete information of its own domain & partial information of other domain.
When users are login to the first time GC is queried for the user & group it belongs to.

As KCTS said universal group membership can't be determined but if you have single domain & single forest universal group is not required.

W/o GC exchange will not able to find DC & will not able to query AD for users & its mailboxes to server their request. GC is a directory which is used to perform ldap search for users & its information.

GC is an important component of AD w/o which AD will not able to server any query performed on DC.

http://www.tech-faq.com/the-global-catalog-server.html
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Lee W, MVPTechnology and Business Process AdvisorCommented:
The first DC is also a GC - WHY would you not setup one?
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KCTSCommented:
You need a GC - without it universal group membership cannot be determined and users will not be able to log on
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Tony_RhoadesAuthor Commented:
Thank you
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