2.1 Authentication Services Overview
The Authentication Services protocols include protocols that provide account authentication, authorization, access control, policy enforcement, data-packets usage accounting, and data-packet auditing services between a client and a server.
These protocols can be used to provide:
Authentication services substantially similar to how a Microsoft Windows® Server domain controller provides authentication services to Windows clients and users.
Windows logon and security subsystems services for Windows clients.
Remote administration functionality to support the authentication services listed above.