Q10.

Which of the following security concepts is accomplished with the installation of a RADIUS server?

A RADIUS (Remote Authentication Dial-In User Service) server provides centralized Authentication, Authorization, and Accounting (AAA) management. The question asks what security concept is accomplished, and "AA" stands for Authentication and Authorization, which are two of the three core functions of RADIUS. When a user attempts to connect to a network service (like a VPN or Wi-Fi), the network access server forwards the credentials to the RADIUS server, which authenticates the user and authorizes their level of access based on configured policies.