Welcome to the ZyXEL Networking Glossary - your definitive source for descriptions of networking terms and ZyXEL's product features.
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The Terminal Access Controller Access-Control System Plus (TACACS+) protocol provides authentication, authorization and accounting for a network by means of an external authentication server. TACACS+ uses TCP, usually on port 49. Although TACACS+ is based on TACACS, it is not compatible with TACACS.