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配置PPP链路层协议时，链路层协议状态始终不能转为Up状态的处理建议：（）A.
PPP链路两端的接口上配置的参数和验证方式都必须一致，LCP检查成功
B.
如果LCP协商失败，请检查LCP配置协商参数
C.
请检查验证方式配置是否正确。因为LCP协商中，包含验证方式的协商。因为LCP协商中，包含验证方式的协商。验证方式协商失败也会导致LCP协商失败
D.
接口试图下先执行shutdown命令将接口关闭，再执行undoshutdown命令重启接口
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