Information, Computer and Network Security Terms Glossary and
Authentication server is a device used in network access control. It stores the usernames and passwords that identify the clients logging on, or it may hold the algorithms for access. For access to specific network resources, the server may itself store user permissions and company policies or provide access to directories that contain the information. Protocols such as RADIUS, Kerboros and TACACS+, and 802.1x are implemented in an authentication server to perform user authentications.