TCP/IP Hear it!

TCP/IP (Transmission Control Protocol/Internet Protocol) Telecom Definition

Referring to the ARPA protocol suite that provides the basis for what has evolved into the Internet and, therefore, often is referred to as the Internet protocol suite. This is a four-layer protocol suite that maps into the OSI Reference Model that followed a few years later.Table T-2 includes the major protocols that comprise the TCP/IP protocol suite as they relate to the ARPA and OSI models.
Table T-2: TCP/IP Protocol Suite
OSI LayerARPA LayerProtocol
7 ApplicationProcess/ ApplicationFTP File Transfer ProtocolSMTP Simple Mail Transfer ProtocolSNMP Simple Network Management ProtocolTELNET Telecommunications Network
6 Presentation
5 Session
4 TransportHost-to-HostTCP Transmission Control ProtocolUDP User Datagram Protocol
3 NetworkInternetARP Address Resolution ProtocolICMP Internet Control Message ProtocolIP Internet Protocol
2 Data LinkNetwork InterfaceLAN, MAN, WAN Network Interface Card (NIC)
1 PhysicalTransmission Media
See also ARP, ARPA, FTP, ICMP, Internet, IP, LAN, MAN, NIC, OSI Reference Model, protocol, SMTP, SNMP, TCP, TELNET, transmission media, UDP, and WAN.