RADIUS and TACACS+ are both protocols used for networking authentication, but they handle the processes of authentication and authorization differently. RADIUS (Remote Authentication Dial-In User Service) combines authentication and authorization into a single process, whereas TACACS+ (Terminal Access Controller Access-Control System Plus) separates these processes. This separation in TACACS+ allows more flexible policy enforcement and better control over commands a user can execute. This difference is well-documented in various network security resources, including Cisco's technical documentation and security protocol manuals.
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