多项选择题
A. IP address
B. encapsulation PPP
C. no shutdown
D. PPP authentication CHAP
E. Speed
F. None of the above
多项选择题 Which of the following statements correctly describes the characteristics of a Frame Relay point-to-point subinterface?（）
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?（）
多项选择题 Which of the following statements regarding ISDN are correct?（）