What does RADIUS stand for and what is its primary function?

The term RADIUS stands for Remote Authentication Dial-In User Service. It is a networking protocol that provides centralized Authentication, Authorization, and Accounting (AAA) management for users who connect and use a network service. The primary function of RADIUS is to facilitate the secure access control process for users attempting to access a network, particularly in scenarios involving dial-up and remote connections.

In this context, the protocol helps verify the identity of users through a central server rather than managing authentication on individual devices or locations. This streamlines the process, enhances security, and allows for easier management of user credentials and access rights from a single point. With its focus on authentication and authorization, RADIUS plays a critical role in network security, especially in environments where remote access is common.