Active Directory is commonly used for this.
It is a centralized authentication service provided by Microsoft.This method of authentication uses Microsoft's Passport service to authenticate users. When you use Passport authentication, a user must have a valid Passport account to access the application.
shared
CHAP
RADIUS
Windows authentication is the default authentication method when you create a new Web application project.
Open system authentication (default).
EAP
Basic Authentication
Centralized file integrity protection!
McDonald's uses Centralized Organizational Structure.
Two-factor authentication uses something a user has in conjunction with something a user knows.
Authentication