Question 1:
In a multi-domain forest, there are six different types of trusts that include parent-child, tree-root, external, realm, forest and shortcut trusts. Each of these trusts is further classified into transitive and non-transitive types with either one-way or two-way directions. The communication between different domains occurs only through establishing one of the different types of trusts. The default trusts (parent-child and tree-root) are automatically created at the time of active directory installation ("How Domain and Forest Trusts Work: Domain and Forest Trusts", 2014). Apart from the default trusts, ...
