单项选择题
What is the operating system do Juniper Networks MX Series routers use?（）
A. IOS B. MX-OS C. UNIX D. Junos OS
多项选择题 Which two statements apply when a user has entered private configuration mode by typing configure private? （）
单项选择题 What information does the help reference command provide?（）
单项选择题 Which command will display only direct routes?（）
