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?（）
A.session 1, destination 2, tunnel 3 B.destination 1, session 2, tunnel 3 C.tunnel 1, session 2, destination 3 D.destination 1, tunnel 2, session 3
单项选择题 Within the L2TP LNS configuration of the router, where is the PPP authentication method specified?（）
多项选择题 Which two statements are true about L2TP tunnel switching?（）
单项选择题 Which L2TP protocol packet is sent by the LAC to establish the control connection (tunnel)?（）
