单项选择题 To dynamically assign host routes on an LNS，where should the ip access-routes command be applied？（）

单项选择题 Where does the LAC obtain the L2TP tunnel’s attributes？（）

单项选择题 You have 50 subscribers accessing a LAC to connectto ISP1.com.What is the L2TP Control Connections and Sessions for the subscribers?（）