ACTIVE DIRECTORY TRUST

Secure communication paths that allow objects in one domain to be authenticated and accepted in other domain.

Some trusts are automatically created.

  • Parent and child domains trusts each other.
  • Tree root domain trusts forest root domain.

Other trusts are manually created.

Forest – to – Forest transitive trust relationships can be created in Windows Server 2003, 2008 and Windows 2012 Forests only.

TRUST RELATIONSHIPS

Trust Category:

  • Transitive and,
  • Non – Transitive Trust
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Domain A trusting on Domain B and, Domain B trusting on Domain C and, if Domain A automatically trusts Domain C then, it is called Transitive Trust.

Domain A trusting on Domain B and, Domain B trusting on Domain C and, if Domain A does not automatically trusts Domain C then, it is called Non - Transitive Trust.


Trust Directions:
Picture
One way incoming – MICROSOFT users can login in HDFC domain but, HDFC user cannot login into MICROSOFT domain.

One way outgoing – HDFC users can login in MICROSOFT domain but, MICROSOFT users cannot login into HDFC domain.

Two ways – Both MICROSOFT and HDFC users can login from either of these domains.

Trust Types:
Default – Two ways trust, Kerberos trusts (Intra Forest)

Shortcut – One or Two way transitive Kerberos trust (Intra Forest) reduces authentication requests.

External – One way non-transitive NTLM trust used to connect to/from Windows NT or external Windows Server 2000 domains. They are manually created.

Forest – One or Two way transitive Kerberos trust. Only between Windows Server 2003, 2008 and 2012 Forest roots. Creates transitive domain relationships.

Realm Trust – One or two way non-transitive Kerberos trusts connect to/from UNIX Kerberos realms.

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