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Active Directory® Administrator's Pocket Consultant by William Stanek

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Managing and Maintaining Name Suffixes

Active Directory uses name suffix routing for routing authentication between domains and across forests that are joined by forest trusts. Within forests, global catalog servers resolve names to enable cross-domain authentication. When a forest trust is created, all unique name suffixes are routed by default to enable authentication across forests.

Configuring User Principal Name Suffixes

Every user account has a user principal name (UPN), which consists of the User Logon Name joined with a UPN suffix by the at sign (@). The names of the current domain and the root domain are set as the default UPN suffix. You can specify an alternate UPN suffix to use to simplify logon or provide additional logon security. ...

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