单项选择题

Which CLI command displays the active L2TP sessions on an LAC?（）

A.show subscriber
B.show l2tp tunnel
C.show l2tp session
D.show tunnel session

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单项选择题
Which sequence of messages demonstrates the communications between the LAC and LNS when theyestablish an L2TP session?（）

A.Incoming Call Reply, Incoming Call Request, Incoming Call Connected
B.Incoming Call Reply, Incoming Call Connected, Incoming Call Request
C.Incoming Call Request, Incoming Call Reply, Incoming Call Connected
D.Incoming Call Request, Incoming Call Connected, Incoming Call Reply
单项选择题
Which statement describes the function of the LNS in a L2TP environment?（）

A.It initiates both the PPP session and the tunnel.
B.It initiates the PPP session and terminates the tunnel.
C.It terminates the PPP session and initiates the tunnel.
D.It terminates the PPP session and terminates the tunnel.
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