Single-forest integration

The single-forest scenario is a commonly used one. A single forest can contain one or multiple domains and a single instance of Azure AD. The express settings of Azure AD Connect support this scenario. We recommend filtering the objects so that service accounts, computers, or other objects won't be synchronized to the cloud:

Additional Azure AD Connect servers connected to the same Azure AD aren't supported. Excluded is the high availability option with the Azure AD Connect staging mode, which is explained in the section, Azure Active Directory Connect high availability.