Widely used in wired and wireless networks, including Wi-Fi and VPNs A client-server protocol for authenticating and authorizing users  - RADIUS (Remote Authentication Dial-in User Service), Terminal Access Controller Access-Control System - TACACS, A AAA (Authentication, Authorization, and Accounting) protocol for remote access Supports encryption and secure authentication protocols  - TACACS+, A ticket-based authentication protocol for secure authentication Uses symmetric key encryption and challenge-response authentication  - Kerberos, Something you know , something you have, something you are - Multi-factor authentication,

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