Most commonly, the Internet Protocol Control Protocol (IPCP) is used, although Internetwork Packet Exchange Control Protocol (IPXCP) and AppleTalk Control Protocol (ATCP) were once popular.
Зазвичай використовується Internet Protocol Control Protocol (IPCP), хоча Internetwork Packet Exchange Control Protocol (IPXCP) і AppleTalk Control Protocol (ATCP) були колись популярні.