(1) A protocol specification that conforms to the latest DOD ARPANET standard. The TCP/IP protocol module corresponds to layers three and four of the ISO protocol model. .A layered set of Protocols that allows sharing of applications among PCS and a high speed communications environment. Because TCP/IP's protocols are standardized across all its layers, including those that provide terminal emulation and File transfer, different vendor's computing devices that run TCP/IP can exist on the SAME Cable and communicate with each other across that cable. Corresponds to layers four (transport) and three (network) of the OSI reference model. (2) Refers to communication protocols used to connect hosts on the Internet. TCP stands for Transmission Control Protocol, which is the main protocol in an IP (Internet Protocol) network. Whereas the IP deals solely with Packet switching, TCP/IP allow two hosts to communicate with long streams of Data at one time, thus always guaranteeing the packets arrive in the correct order.