单项选择题
You enter configuration mode with the configure command. You need to abort the changes that you have made and start again with a fresh copy of the active configuration. Which command should you use?（）
A.rollback 0 B.load active C.reset config D.clear candidate config
单项选择题 You are the top of the hierarchy in configuration mode. How would you save your configuration to a file on the router?（）
单项选择题 What information does the help topic command provide?（）
单项选择题 The auto-complete feature in the JUNOS CLI is triggered by which method?（）
