Isolation gives independent and privileged control over the resources. Administrators can control resources independently and no other accounts can take control.

There are two types of isolations:

• Service isolation: This will prevent any other control or interference with AD DS other than the administrators defined in it. In other words, it will provide full control over identity infrastructure. Service isolations happen mainly due to operations or legal requirements. As an example, Rebeladmin Corp. has three different services that are built in-house. Each service has its own customer base. Operations in one product should not impact others. Service isolation will allow the organization to isolate the operation for each service.
• Data isolation: This will provide ownership of the data that is stored in Active Directory or domain-joined computers to individuals or groups of administrators. However, data administrators cannot prevent the service administrator from accessing the resource they control. In order to isolate a subset of data completely, they will need to create a separate forest.

The number of forests needed for an infrastructure depends on the autonomy or isolation requirements.