单项选择题
Which command returns a list of commands in which a given keyword is used throughout the Junos hierarchies?（）
A. help topic B. help reference C. help apropos D. help tip
多项选择题 Which three commands will cause a logical interface to go administratively down after being committed?（）
单项选择题 Which command will display the active configuration?（）
多项选择题 Which two statements are true about the configure exclusive command?（）
