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A radius server is a server that is responsible for authenticating and authorizing users who request access to a network. It is commonly used in enterprise and service provider networks to provide secure access to wireless and remote network devices. Here's a brief overview of the characteristics of a radius server : A user or client attempts to approach a network resource, such as a wireless access point, VPN server, or router. The network device sends a request to have an approach to the radius server. The radius server acquires the request and inspects its database for a matching user account and credentials. The radius server sends access to accept messages to the network device if the user is authorized. If the user is not authorized, the radius server sends access to a reject message to the network device, and the user is denied access. In addition to authentication and authorization, a radius server can also provide accounting services, which allow network administrators to

Radius is a  framework of networking protocol that delivers centralized Authentication, Authorization, and Accounting (AAA) management for users to attach and operate a network service. The actual process of how Radius Authentication works is relatively simple and involves the communication between a server and a client. In most cases, the server is a networking device like a router responsible for connecting to a network and controlling all access. The server will store and maintain a list of all users allowed to connect to the network and their associated credentials. When a user attempts to connect to the network, the server will authenticate and authorize the user before allowing them to access the network resources. The client in this process is typically a Radio server client attempting to connect to a network. First, the client will ask the server to establish and permit the user. The server will then either allow or deny the user access to the network. Radius Authentication is