Creating the right trust

In an Active Directory environment with multiple domains, you're bound to have trusts. Trusts allow people to access resources in a domain or forest other than the domain or forest where their user accounts reside.

When Active Directory domains are added to an existing Active Directory domain, two-way transitive trusts are automatically created. However, in other situations, trusts have to be created manually. With many different types of trusts, two trust directions, and a choice in transitivity, which trust is the right trust for which situation?

Let's look at the six types of trust first:

• Parent-child trust: The parent-child trust is a trust type that is automatically created when you add a domain to a tree root. For example, a parent-child trust is automatically created between adatum.com and sub.adatum.com. You cannot manually create a parent-child trust.
• Tree-root trust: The tree-root trust is a trust type that is also automatically...