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。
Therefore, an alternative version of example configuration 100 may replace serial cluster 145 with a single intercepting network device on the client side of the WAN 150.
因此，示例配置100的替换性版本可在WAN150的客户端端用单个截取网络设备来代替串行群集145。
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