多项选择题
Which two media types support asynchronous transfer mode?（）
A.T3 B.SONET C.Gigabit-Ethernet D.EIA/TIA-232 serial
单项选择题 Which statement is true about configuring a back-to-back connection frame-relay on Juniper Routers?（）
单项选择题 Which logical unit number must be configured on an interface using PPP encapsulation?（）
多项选择题 Which two are valid configurations of an interface?（）
