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The Remote Authentication Dial-In User Service (RADIUS) is a client/server protocol used for centralized authentication, authorization, and accounting. The RADIUS client is typically a network access server (NAS), and the RADIUS server is usually a process running on a UNIX or Windows NT machine. The client passes user information to designated RADIUS servers and acts on the response that is returned. RADIUS servers receive user connection requests, authenticate the user, and then return the configuration information necessary for the client to deliver service to the user. A RADIUS server can act as a proxy client to other RADIUS servers or other kinds of authentication servers.
A Reverse Proxy is a server that sits in front of one or more web servers, intercepting requests from clients. A reverse proxy commonly performs tasks such as load-balancing, authentication, decryption, or caching.
Role-based Access Control (RBAC) is a model of assigning system access to users based on their role in an organization. With RBAC, organizations can create roles, assign role membership (static or dynamic), and define access policies specific to each role. RBAC provides fine-grained control and offers a simple, manageable approach to access management that is less prone to error than assigning permissions to users individually.