These reference architectures show options for integrating your on-premises Active Directory (AD) environment with an Azure network. Which should I choose?
Integrate with Azure Active Directory (Azure AD)
Integrate on-premises Active Directory domains and forests with Azure AD.
Extend Active Directory Domain Services (AD DS) to Azure
Extend your Active Directory environment to Azure to provide distributed authentication using AD DS.
Create an AD DS forest in Azure
Create a separate Active Directory domain in Azure that is trusted by domains in your on-premises forest.
Extend Active Directory Federation Services (AD FS) to Azure
Use AD FS to perform federated authentication and authorization for components running in Azure.