What Does Network Control Protocol (NCP) Mean?Network Control Protocol (NCP) was an early protocol implemented by ARPANET, the world's first operational packet-switching network that later evolved into what became the Internet. NCP allowed users to access and use computers and devices at remote locations and to transmit files between computers. NCP provided the middle layer of the protocol stack, and enabled application services such as email and file transfer.
Whether the term is Network Control Protocol or Network Control Program is a matter of some debate, as both terms are used to refer to this ARPANET protocol.
NCP was replaced by TCP/IP in the 1980s.