单项选择题
Which CLI mode allows you to make configuration changes?（）
A. enable mode B. configuration mode C. operational mode D. active mode
单项选择题 Which command do you use to display the messages seen during the last system boot?（）
单项选择题 During a password recovery, what is the next step after configuring the system to boot into single-user mode?（）
多项选择题 What are three benefits of class of service?（）
