RADIUS (Remote Authentication Dial-In User Service) - Common AAA protocol, centralizes user authentication., TACACS (Terminal Access Controller Access-Control System) - Dial-up access control to ARPANET, predecessor of TACACS+., TACACS+ - Enhanced TACACS with more response codes, open standard., Kerberos - Network protocol for mutual authentication, prevents replay attacks., SSO with Kerberos - Single authentication, cryptographic tickets, Kerberos-exclusive., Choosing an Authentication Method - Depends on infrastructure, like VPN for RADIUS, Cisco for TACACS+., Multi-Factor Authentication - Requires multiple verification factors, varies in cost.,

Comptia A+ core 2 authentication methods

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