Network Control Protocol
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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, the Internetwork Packet Exchange Control Protocol for the Internet Packet Exchange protocol, the AppleTalk Control Protocol for AppleTalk, and the IPv6 Control Protocol exists for IPv6.
This protocol operates on the Network link layer and is defined in RFC 1332.