Trusts can have different directionality and transitivity
There are transitive and nontransitive trusts
Trusts can be transitive or nontransitive. In a transitive trust, A trusts B and B trusts C, and then A also implicitly trusts C. For example, if you lend Steve your laptop, and Steve lends his car to Mary, then you might be willing to lend your mobile phone to Mary.
There are one-way or two-way trusts
A one-way trust means that, although one entity trusts the other, the reciprocal is not true. For example, just because you lend Steve your laptop does not mean that Steve will lend you his car. In a two-way trust, both entities trust one another. In a single forest, all domains trust one another with internal, two-way transitive trusts. Basically, this means that all domains trust all other domains.
