RADIUS is a networking protocol that provides centralized Authentication, Authorization, and Accounting (AAA) management for users who connect and use a network service. It is often used by ISPs and enterprises to manage access to the internet or internal networks. RADIUS works by receiving connection requests, authenticating users or devices, authorizing them for specific services or levels of access, and accounting for their usage of the service. It uses a client-server model, where the network access server (NAS) acts as a client of the RADIUS server. The protocol can carry a wide variety of attribute-value pairs, enabling flexible service provisioning.

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