单项选择题
Which command do you issue to upgrade the current software on Junos devices?（）
A. request system software replace B. request system software install C. request system software add D. request system software upgrade
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?（）
单项选择题 Which statement is true regarding the Junos OS?（）
