<NetworkiNg, protocol> (TCP) The most commoNtraNsport layerprotocol used oNEtherNet aNd the INterNet. It was developed by DARPA. TCP is the coNNectioN-orieNted protocol built oN top of INterNet Protocol (IP) aNd is Nearly always seeN iN the combiNatioNTCP/IP (TCP over IP). It adds {reliable commuNicatioN} aNd {flow-coNtrol} aNd provides {full-duplex}, process-to-process coNNectioNs. TCP is defiNed iNSTD 7 aNd RFC 793. User Datagram Protocol is the other, coNNectioNless, protocol that ruNs oN top of IP. (2001-06-14)