Active Directory allows administrators to centrally manage user access and permissions across an organization. It uses trusts to enable users in one domain to access resources in another domain. There are different types of trusts including one-way and two-way trusts, as well as transitive and non-transitive trusts. The default trust setup allows all domains within a Windows Active Directory forest to implicitly trust each other.

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( Meer Shahanawaz ) ( Abdullah )
Active Directory is an implementation of LDAP directory services by Microsoft for use
in Windows environments. Active Directory allows administrators to assign enterprise-
wide policies, deploy programs to many computers, and apply critical updates to an entire
organization. An Active Directory stores information and settings relating to an
organization in a central, organized, accessible database. Active Directory networks can
vary from a small installation with a few hundred objects, to a large installation with
millions of objects.
Active Directory Domain and Trust
Trust
To allow users in one domain to access resources in another, AD uses trust. Trust is
automatically produced when domains are created. The forest sets the default boundaries
of trust, not the domain, and implicit trust is automatic. As well as two-way transitive
trust, AD trusts can be shortcut (joins two domains in different trees, transitive, one- or
two-way), forest (transitive, one- or two-way), realm (transitive or nontransitive, one- or
two-way), or external (nontransitive, one- or two-way) in order to connect to other forests
or non-AD domains. AD uses the Kerberos V5 protocol, although NTLM is also
supported and web clients use SSL/TLS.
Trusts in Windows 2000 (native mode)
Simply speaking, AD uses trust to allow users in one domain to have access to resources
in another domain. The AD trust has a two way trust with its parent. The root of every
tree has a two way trust with the Forest Root domain. As a result, every domain in the
forest, either explicitly or implicitly, trusts every other domain in the forest. These default
trusts cannot be deleted.
Trust relationship is a description of the user access between two domains consisting of a
one way and a two way trust.
• One way trust - When one domain allows access to users on another domain, but
the other domain does not allow access to users on the first domain.

2. • Two way trust - When two domains allow access to users on the other domain.
• Trusting domain - The domain that allows access to users on another domain.
• Trusted domain - The domain that is trusted; whose users have access to the
trusting domain.
• Transitive trust - A trust that can extend beyond two domains to other trusted
domains in the tree.
• Intransitive trust - A one way trust that does not extend beyond two domains.
• Explicit trust - A trust that an admin creates. It is not transitive and is one way
only.
• Cross link trust - An explicit trust between domains in different trees or in the
same tree when a descendent/ancestor (child/parent) relationship does not exist
between the two domains.
Windows 2000 - supports the following types of trusts:
• Two way transitive trusts.
• One way non transistive trusts.
After making the Trust, at any system on two domains clinet login screen will be :