TACACS+ is developed by Cisco and release as an open standard in the early 1990s.
TACACS+ is mainly used for AAA device access control but it is possible for to be used for network access too.
TACACS+ uses TCP port 49 to communicate between TACACS+ clients and the TACACS+ server
TACACS+ can provide authentication, authorisation and accounting in separate functions. This is the main reason why TACACS+ is preferred over RADIUS for network device access control.