transmission control protocol over internet protocol.

The de facto standard ethernet protocols incorporated into 4.2bsd unix. TCP/IP was developed by darpa for internetworking and encompasses both network layer and transport layer protocols. While tcp and ip specify two protocols at specific protocol layers, TCP/IP is often used to refer to the entire dod protocol suite based upon these, including telnet, ftp, udp and rdp.

See also icmp, smtp, snmp.