多项选择题
Which of the following are key characteristics of PPP (Choose three.)（）。
A.can be used over analog circuits B.maps Layer 2 to Layer 3 address C.encapsulates several routed protocols D.supports IP only E.provides error correction
多项选择题 Whichthreeelementsmustbeusedwhenyouconfigurearouterinterfaceforvlantrunking？（）
多项选择题 Which two benefits are provided by using a hierarchical addressing network addressing scheme? （）
单项选择题 Which dose the frame-relay interface-dlinterface-dlcci command configure?（）
