点对点隧道协议 point-to-point tunneling protocol (pptp); pptpoint to point tunneling protocol 点对点网络协议 ppp，point-to-point protocol
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...点对点通道协议 point to point tunneling protocol (pptp); pptp:point-to-point tunneling protocol; pptpoint to point tunneling protocol 点对点通讯协定 point to point protocol ..
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