Transmission Control Protocol. One of the core protocols of the IP suite that guarantees that data sent from one node will be received by the other in its entirety.
Telnet
A protocol in the TCP/IP stack that provides terminal emulation used for connecting to and controlling remote systems.
TFTP
Trivial File Transfer Protocol. A simple protocol that is similar to FTP and used for transferring small files between hosts on a network. Unlike FTP, which uses TCP port 21, TFTP utilizes UDP port 69.
Trojan horse
A program that might appear useful on the surface but in which harmful or malicious code is contained.
