单项选择题
Which L2TP protocol packet is sent by the LAC to establish the control connection (tunnel)?（）
A.Start Tunnel Discovery Request B.Start Control Connection Request C.L2TP Control Connection Request D.L2TP Tunnel Establishment Request
单项选择题 What is the functionality of L2TP in a BRAS environment?（）
单项选择题 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?（）
