Which statement about RADIUS is true?

RADIUS (Remote Authentication Dial-In User Service) is primarily known for its role in providing authentication, authorization, and accounting (AAA) services. While it does include authentication, it goes beyond that by also offering accounting features that can track user activity and usage of services, which supports auditing activities. This aspect allows organizations to maintain detailed logs about who accessed what resources, which is crucial for security and compliance.

The auditing services RADIUS provides are important for organizations to monitor access patterns and identify any potential security issues. These auditing capabilities are part of its core functionality and enhance the overall security posture of the networked environment.

RADIUS does not exclusively cater to dial-in services; it can be used in various contexts including, but not limited to, network access control for wired and wireless connections. Additionally, compatibility with open-source systems is not a requirement of RADIUS; rather, many proprietary devices also support RADIUS, illustrating its flexibility and widespread adoption across different environments.