An example of an application layer client-server networking protocol is the Remote Authentication Dial-In User Service (RADIUS). The free RADIUS protocol requires a RADIUS Server and RADIUS Clients. Continue reading to learn more about Radius. What Exactly Is Radius? Authentication, authorization, and accounting (AAA) for distant users who access network services are managed using the networking protocol known as RADIUS (Remote Authentication Dial-In User Service). It offers a centralized way to manage network access control. It can identify people logging on to a network using different types of hardware, such as routers, firewalls, and VPNs. The RADIUS protocol calls for both a FreeRADIUS Server and RADIUS Clients. For remote users who access a network, a RADIUS server is a central server that offers authentication and authorization services. It takes requests for authentication from RADIUS clients, including routers, firewalls, or VPNs, verifies the user's credentials,...