单项选择题
You want to log in to the router and make a configuration change. After logging in as the root user, what is the next command you must enter?（）
A. enable B. configure C. edit D. cli
单项选择题 Which command do you use to identify the meaning of a syslog message?（）
单项选择题 What information does the help reference command provide?（）
多项选择题 Which two commands will successfully create ping traffic?（）
