Short for Terminal Access Controller Access Control System, an authentication protocol that was commonly used in UNIX networks. TACACS allows a remote access server to communicate with an authentication server in order to determine if the user has access to the network.
TACACS is now somewhat dated and is not used as frequently as it once was. A later version of TACACS was called XTACACS (Extended). These two versions have generally been replaced by TACACS+ and RADIUS in newer or updated networks. TACACS+ is a completely new protocol and is therefore not compatible with TACACS or XTACACS.
TACACS is detailed in RFC 1492.
Short for tiny area network, a LAN with only a few nodes. TANs are typically installed in homes or small office environments so that the devices can share resources, such as modems, files or printers.
Short for Telephony Application Programming Interface, an API for connecting a PC running Windows to telephone services. TAPI was introduced in 1993 as the result of joint development by Microsoft and Intel. The standard supports connections by individual computers as well as LAN connections serving many computers. Within each connection type, TAPI defines standards for […]
Short for Telecommunications Closet, an area, typically a room or closet, that houses all the equipment associated with telecommunications wiring systems. The TC also serves as a termination point for the horizontal cabling system of a network, the point of circuit administration and contains the network’s distribution panels, cross-connects and backbone. All telecommunications wiring is […]
Short for trusted computing base. TCB refers to the totality of protection mechanisms (hardware, firmware and software) that provide a secure computing environment. The TCB includes everything that must be trusted — access control, authorization and authentication procedures, cryptography, firewalls, virus protection, data backup, and even human administration — in order for the right level […]
Abbreviation of Total Cost of Ownership, a very popular buzzword representing how much it actually costs to own a PC. The TCO includes: Original cost of the computer and software Hardware and software upgrades Maintenance Technical support Training Most estimates place the TCO at about 3 to 4 times the actual purchase cost of the […]