Editing Authentication protocol (section)

====[[TACACS]], [[XTACACS]] and [[TACACS+]]====
The oldest AAA protocol using IP based authentication without any encryption (usernames and passwords were transported as plain text). Later version XTACACS (Extended TACACS) added authorization and accounting. Both of these protocols were later replaced by TACACS+. TACACS+ separates the AAA components thus they can be segregated and handled on separate servers (It can even use another protocol for e.g. Authorization). It uses [[Transmission Control Protocol|TCP]] (Transmission Control Protocol) for transport and encrypts the whole packet. TACACS+ is Cisco proprietary.