单项选择题
Which command would you use to view interface usage details in real time?（）
A. show interfaces terse B. show interfaces extensive C. monitor interface traffic D. monitor traffic interface
单项选择题 Which action does the ping 172.18.1.1 size 5 command perform?（）
单项选择题 Which command gracefully shuts down the Junos OS?（）
单项选择题 To which directory does the Junos OS write traceoptions files?（）
