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

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.

单项选择题Which command parameter configures a password of connection-to-lac for an L2TP tunnel on an LNS?（）

A.l2tp password connection-to-lac
B.local password connection-to-lac
C.tunnel password connection-to-lac
D.server password connection-to-lac

单项选择题Which configuration command dynamically detects and configures a PPPoA interface?（）

A.auto-configure ip
B.auto-configure ppp
C.auto-configure pppoe
D.auto-configure bridgedethernet

单项选择题With the command atm bulk-config test vc-range 1 3 200 400, what is the correct interpretation of the numeric values following the vc-range?（）

A.vpi 1 vci 200, vpi 3 vci 400
B.vpi 1 through 3, vci 200 through 400
C.vpi 1 vci 200 through 400, vpi 3 vci 200 through 400
D.vci 1 through 3, vpi 200 through 400