ACTIVE DIRECTORY

Active Directory Forest Trust

An Active Directory forest trust diagram shows the identity boundary between two independently managed forests and the services that need to cross it. Place one domain controller and the relevant administrative or application services inside each forest boundary. Then label the trust and the access path that depends on it. The result helps administrators explain whether two domains are part of the same environment or only connected for a limited collaboration need. It is a useful starting point for a security review because readers can see where authentication authority ends and shared access begins. Add direction and scope when documenting a one-way trust or a specific application relationship.

UPDATED 2026-09-24
EXAMPLEActive Directory Forest Trust
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CASE ANALYSIS

Scenario

Document identity relationships between two separately managed Active Directory forests.

Key decisions

  • Separate forests: Each organization keeps its own domain controller and administration tools.
  • Forest trust: The trust is shown as an explicit identity relationship.
  • Cross-forest access: The application path explains why the trust exists.

When to reuse this

Use this view to discuss trust boundaries and shared application access; use a domain topology for individual network segments.

FAQ

Frequently asked questions

What is a forest trust?01
A forest trust is an Active Directory trust relationship that can allow authentication and resource access between domains in separate forests.
Why document a trust?02
A diagram clarifies the identity boundary, the systems involved, and the access path that relies on the trust.
Does a trust merge two forests?03
No. The forests remain separately managed; the trust establishes a defined relationship between them.
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