certificate services , Saml, Scom, Dns, Kerberos, Group Policy, Adfs, Azure Ad, Entra ID, AD object automation with scripting, OAuth 2.0, Windows Authentication, AD migrations, AD operational level upgrades, Security schema changes, OpenID Connect, AD management, AD architecture and infrastructure 2019, AD-integrated DNS, Single Sign-On, Active Directory, Azure architecture, LDAP Directory Replication, AzureAD ADConnect tools