ANSI: Frame relay en capa 2; ITU: X25 en capa 3;
ITU: High Level Data Link Control (HDLC) capa 2;
IBM:Synchronous Data Link Control (SDLC) capa 2;
ITU:Link Access Procedure (LAPB, LAPD) capa 2;
IETF: Point-to-Point Protocol (PPP) capa 2
7. Protocolos Standard LAN
NETBUI de Microsoft, IPX / SPX (Internet
/ Sequence Packet Exchange) de Novell,
Apple Talk de Apple, TCP / IP de uso
público