Understanding the Federated-Forests Model
A feature of Windows Server 2012’s AD DS implementation is the concept of cross-forest transitive trusts. In essence, this allows you to establish transitive trusts between two forests with completely separate schemas that allow users between the forests to share information and to authenticate users.
The capability to perform cross-forest trusts and synchronization is not automatic, however, because the forest functionality of each forest must be brought up to at least Windows Server 2003 (or later) functional levels.
The federated-forest design model is ideal for two different situations. One is to unite two disparate AD DS structures in situations that arise from corporate acquisitions, mergers, and ...
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