Best Practices for Trusts
Creating trusts enables the use of resources across domains and forests. Use the following best practices when considering the creation of trust relationships:
Create shortcut trusts when long trust paths must be frequently used to access resources in other domains within the forest.
Create trusts with external domains only when there is a need to access resources between forests.
Create one-way trust relationships if that will fulfill the requirement. Do not make every trust a two-way trust.
Create a forest trust only if many domain trust relationships between domains in the different forests are necessary. If only a few trust relationships are necessary, it may be better to create separate external trusts.
Use selective ...