单项选择题 Which function enforces logical data throughput rates that are below the actual physical line rate of a port?（）

单项选择题 With the following CLI command output performed on an LNS: show l2tp session L2TP session 1/2/3 is up .What is the meaning of the numeric values in the output?（）

单项选择题 Within the L2TP LNS configuration of the router, where is the PPP authentication method specified?（）