The transparent transmission and negotiation or configuration options are sonic sophisticated issues in Point-to-Point Protocol(PPP) used by WAN routers.
在广域网路由器所用的PPP协以小， 透明传输及配置选项协商是一些较为复杂的问题。
Particularly the author explains Point-to-point protocol (PPP) realization exhaustively.
特别对点对点协议(PPP)协议的实现做了详尽阐述。
PPP (Point to Point protocol) is a link layer protocol, which be used in a good many occasion. On the other hand, itis a complex communicate protocol.
PPP(点对点协议)是数据链路层协议，应用极为广泛，也是一个比较复杂的通信协议。
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