多项选择题
Which three functions are available under the "Maintain" tab of J-Web?（）
A. download and delete log files B. view real-time statics of interfaces C. reboot the system D. view and add licenses E. edit security settings
单项选择题 Which command do you issue to upgrade the current software on Junos devices?（）
单项选择题 Which command do you use to identify the meaning of a syslog message?（）
多项选择题 Two devices on an Ethernet segment sent frames at the same time causing a collision. Which twostatements are true?（）
