Security
7450 ESS System Mangement Guide Page 27
TACACS+ Authentication
Terminal Access Controller Access Control System, commonly referred to as TACACS is an
authentication protocol that allows a remote access server to forward a user's logon password to an
authentication server to determine whether access can be allowed to a given system. TACACS is
an encryption protocol and therefore less secure than the later Terminal Access Controller Access
Control System Plus (TACACS+) and RADIUS protocols.
TACACS+ and RADIUS have largely replaced earlier protocols in the newer or recently updated
networks. TACACS+ uses Transmission Control Protocol (TCP) and RADIUS uses the User
Datagram Protocol (UDP). TACACS+ is popular as TCP is thought to be a more reliable protocol.
RADIUS combines authentication and authorization. TACACS+ separates these operations.
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