RADIUS
Use this option to authenticate users on a RADIUS server.
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Cisco strongly discourages the use of RADIUS (RADIUS username/password only) as a single form of authentication. If the RADIUS server does not provide multi-factor authentication (MFA), then you must enable a second factor of authentication in Secure Access for VPN authentication. You can configure certificates in Secure Access as the second form of authentication.
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When you choose RADIUS, each user is authenticated using RADIUS group servers. RADIUS authentication for remote access VPNs supports RADIUS, RADIUS+ Single CA certificate, and RADIUS+ Multiple CA Certificates.
