多项选择题 Which two login-class permissions could permit a user to view the system hierarchy of the active configuration?（）

单项选择题 The authentication order configuration on your M120 includes the settings tacplus and radius (in that order), but does not include the password parameter. You attempt to log in to the device, but the network containing the authentication servers is currently down. Which statement is true about your login attempt?（）

多项选择题 Which two external authentication methods are supported by the Junos OS for user authentication?（）