The service that offers a central authentication point for wireless, mobile, and remote users is called a Remote Authentication Dial-In User Service (RADIUS). RADIUS is a client/server protocol that enables network administrators to manage remote access authentication, authorization, and accounting (AAA) in a centralized manner. It is commonly used by Internet Service Providers (ISPs) and enterprises to provide secure access to their networks for remote users. RADIUS servers are responsible for authenticating users and devices and for enforcing network access policies.