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SMTP简单邮件传输协议TCP传输协议IP网际协议AppleTalk可路由协议组IrDA红外线数据协议SLIP串行线路网际协议PPP点到点协议PPTP点到点隧道协议L2TP第二层隧道协议IPsecInternet协议安全NetBEUINetBIOS增强型用户接HTTP超文本传输协议UDP用户报文协议ARP地址解析协议ICMPInterne
SMTP Simple Mail Transfer Protocol TCP Transport Protocol IP Internet Protocol AppleTalk Routing Protocol Group IrDA Infrared Data Protocol SLIP Serial Line Internet Protocol PPP Point-to-Point Protocol PPTP Point-to-Point Tunneling Protocol L2TP Layer 2 Tunneling Protocol IPsecInternet Protocol Security NetBEUINetBIOS Enhanced User Connect HTTP Hypertext Transfer Protocol UDP User Message Protocol ARP Address Resolution Protocol ICMPInterne