HOW A RADIUS SERVER WORKS
A RADIUS server utilizes a central database to authenticate remote users. RADIUS functions as a client-server protocol, authenticating each user with a unique encryption key when access is granted. How a RADIUS server works depends upon the exact nature of the RADIUS ecosystem. Below is an overview of how RADIUS servers work.
- First, the user initiates authentication to the network access server (NAS).
- The network access server then requests either a username and password or a challenge (CHAP).
- The user replies.
- Upon receiving the user’s reply, the RADIUS client sends the username and the uniquely encrypted password to the RADIUS server.
- The RADIUS server accepts or rejects the user.
RADIUS servers are well known for their AAA capabilities — Authentication, Authorization, and Accounting. The main advantage of the centralized AAA capabilities of a RADIUS server are heightened security and better efficiency. RADIUS servers provide each business with the ability to preserve the privacy and security of both the system and each individual user.
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