Network Control Protocol

Not to be confused with Network Control Program.

A Network Control Protocol is a protocol that runs atop the Point-to-Point Protocol (PPP) and that is used to negotiate options for a network layer protocol running atop PPP. Network Control Protocols include:

• the Internet Protocol Control Protocol for the Internet Protocol (protocol code number 0x8021), RFC 1332
• the DECnet Phase IV Control Protocol (DNCP) for DNA Phase IV Routing protocol (DECnet Phase IV), (protocol code number 0x8027), RFC 1376
• the OSI Netwok Layer Control Protocol (OSINLCP) for the various OSI network layer protocols, (protocol code number 0x8023), RFC 1377
• the AppleTalk Control Protocol for AppleTalk (0x8029), RFC 1378
• the Internetwork Packet Exchange Control Protocol for the Internet Packet Exchange protocol (0x802B), RFC 1552
• the IPv6 Control Protocol for IPv6 (0x8057), RFC 5072

NCP operates on the link layer and is defined in RFC 1332.