单项选择题
In regard to a hub and spoke Frame-Relay data network, what kind of physical network is it classified as?（）
A. point-to-point B. broadcast multi-access C. nonbroadcast multipoint D. nonbroadcast multi-access E. broadcast point-to-multipoint
多项选择题 Which of the following statements regarding ISDN are correct?（）
多项选择题 Which of the following are correct regarding ISDN?（）
单项选择题 You have a single ISDN BRI B channel. What is its maximum bandwidth capacity of this one channel?（）
