What is Trust:-

• Secure communication path the allow objects in one domain to be authenticated and accepted in other domains.

• Some trusts are automatically created.

               - Parent-child domain trust each other
               - Tree root domain trust forest root domain

• Other trusts are manually created

• Forest-to-Forest transitive trust relationships can be created in Windows Server 2003 and Windows Server 2008 forests only

Trust Relationships:-

Type of Trusts:-
Default:-
- Two-way-transitive Kerberos trust (Intraforest)

Shortcut:-
- One or two-way transitive Kerberos trust (Intraforest)

External:-
- One way non-transitive NTML trust. Used to connect to/from Windows NT or external 2000 domains Manually created

Forest:-
- One or two-way transitive Kerberos trust. Only between 2003 or 2008 Forest

Realm:-
- One or two-way-non-transitive Kerberos trust Connected to/from UNIX Kerberos realms