RADIUS is an open-standard AAA protocol that provides centralized Authentication, Authorization, and Accounting for remote user access.

It uses UDP as its transport protocol and is commonly deployed for securing Wi-Fi networks via 802.1X, authenticating broadband subscribers, and managing VPN access.

With extensive vendor support, including implementations like FreeRADIUS, Microsoft NPS, and Cisco ISE, RADIUS remains a cornerstone of network access control.

RADIUS encrypts only the password field in its packets, making transport security a consideration; however, its widespread compatibility and simplicity make it ideal for access-layer authentication scenarios.

It is commonly used in enterprise, education, and ISP environments to centralize authentication against existing user directories.

For enhanced security, RadSec (RADIUS over TLS) wraps the entire exchange in encrypted transport . As a foundational protocol for Network Access Control (NAC), RADIUS enables organizations to implement robust access policies for both wired and wireless networks.

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