Azure Active Directory - Topologies for Azure AD Connect

Topologies for Azure AD Connect - Link

This article describes various on-premises and Azure Active Directory (Azure AD) topologies that use Azure AD Connect sync as the key integration solution. This article includes both supported and unsupported configurations.

On-premises Active Directory forest
On-premises Active Directory with filtered import
Azure AD Connect sync server
Azure AD Connect sync server “staging mode”
GALSync with Forefront Identity Manager (FIM) 2010 or Microsoft Identity Manager (MIM) 2016
Azure AD Connect sync server
Azure Active Directory
Unsupported scenarios