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→Dial-Up Access
== Dial-Up Access ==
Despite the wide availability of broadband internet access we still haven't quite fully escaped from the confines of dial-up access. The primary authentication protocols used on dial-up connections are Terminal Access Controller Access Control System (TACACS), Terminal Access Controller Access Control System (TACACS+) and Remote Authentication Dial-In User Service (RADIUS).
== Terminal Access Controller Access Control System (TACACS) ==
An early using based Remote Access Server (RAS) technology designed to transmit encrypted authentication data to a separate authentication server. TACACS does not provide itself authentication service.
== Remote Authentication Dial-In User Service (RADIUS) ==
A User Datagram Protocol (UDP) based protocol designed to provide both authentication and authorization services. Authentication functions are provided by a RADIUS server using a symmetric private key. Authorization is provided through stored user profiles.
== Terminal Access Controller Access Control System (TACACS) ==
The TACACS+ extends the basic TACACS protocol by adding authentication and authorization functionality similar to that provided by RADIUS. Unlike RADIUS, TACACS+ is Transmission Control Protocol (TCP) rather than UDP based.
== Secure Shell (SSH) ==
