· Two-way trust: A trust relationship between two domains in which both domains trust each other. For example, domain A trusts domain B, and domain B trusts domain A. All parent-child trusts are two-way trusts.
· One-way: incoming trust: A one-way trust relationship between two domains in which the direction of the trust points toward the domain from which you start the New Trust Wizard (and which is identified in the wizard as This domain). When the direction of the trust points toward your domain, users in your domain can access resources in the specified domain. For example, if you are the domain administrator in domain A and you create a one-way, incoming trust to domain B, this provides a relationship through which users who are located in domain A can access resources in domain B. Because this relationship is one-way, users in domain B cannot access resources in domain A.
· One-way: outgoing trust: A one-way trust relationship between two domains in which the direction of the trust points toward the domain that is identified as Specified domain in the New Trust Wizard. When the direction of trust points toward the specified domain, users in the specified domain can access resources in your domain. For example, if you are the domain administrator in domain A and you create a one-way, outgoing trust to domain B, this provides a relationship through which users who are located in domain B can access resources in domain A. Because this relationship is one way, users in domain A cannot access resources in domain B.
· Domain-wide authentication: An authentication setting that permits unrestricted access by any users in the specified domain to all available shared resources that are located in the local domain. This is the default authentication setting for external trusts.
· Forest-wide authentication: An authentication setting that permits unrestricted access by any users in the specified forest to all available shared resources that are located in any of the domains in the local forest. This is the default authentication setting for forest trusts.
· Selective authentication: An authentication setting that restricts access over an external trust or forest trust to only those users in a specified domain or specified forest who have been explicitly given authentication permissions to computer objects (resource computers) that reside in the local domain or the local forest. This authentication setting must be enabled manually.
What types of trust relationships does Windows Server 2003 support?
Windows 2003 supports six types of trusts (although the OS doesn't support all types for all forest modes):
- Tree-root trust--Windows 2003 automatically creates a transitive, two-way trust when you add a new tree-root domain to an existing forest. Tree-root trusts let every domain in different trees in the same forest implicitly trust one another.
- Parent-child trust--Windows 2003 automatically creates a transitive, two-way trust when you add a child domain to an existing domain. This trust lets every domain in a particular tree implicitly trust one another.
- Shortcut trust--When domains that authenticate users are logically distant from one another, the process of logging on to the network can take a long time. You can manually add a shortcut trust between two domains in the same forest to speed authentication. Shortcut trusts are transitive and can either be one way or two way.
- External trust--Administrators can manually create an external trust between domains in different forests or from a Windows 2003 domain to a Windows NT 4.0 or earlier domain controller (DC). External trusts are nontransitive and can be one way or two way.
- Forest trust--When two forests have a functional level of Windows 2003, you can use a forest trust to join the forests at the root. An administrator can manually create a two-way forest trust that lets all domains in both forests transitively trust each other. Forest trusts can also be one way, in which case the domains in only one of the forests would trust the domains in the other forest. Multiple forest trusts aren't transitive. Therefore, if forest A has a forest trust to forest B and forest B has a forest trust to forest C, forest A does not implicitly trust forest C.
- Realm trust--An administrator can manually create a realm trust between a Windows 2003 domain and a non-Windows Kerberos 5 realm. Realm trusts can be transitive or nontransitive and one way or two way.
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