Compare Entra ID and Active Directory Domain Services (AD DS)
Active Directory Domain Services (AD DS)
- True directory service, with a hierarchical X.500-based structure
- Uses organizational units (OUs) and Group policy Objects (GPOs) for management
- Can be queried and managed through Lightweight Directory Access Protocol (LDAP) calls
- Primarily uses Kerberos for authentication
- Include computer objects, representing computers that join an Active Directory domain
- Uses Domain Name System (DNS) for locating resources such as domain controllers
- AD DS uses trusts between domains for delegated management
Microsoft Entra ID
- Primarily an identify solutions that is designed for internet-based applications
- There are no OUs or GPOs
- Uses HTTP and HTTPS protocols such as SAML, WS-Federation, and OpenID Connect for authentication
- Includes federation services, and many third-party services are federated with and trust Microsoft Entra ID

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