单项选择题 How can you reset your router or switch to factory defaults?（）

单项选择题 Which command would allow you to compare two files stored on your router?（）

单项选择题 You have just issued the command commit confirmed and your network continues to be operational with no further changes required. You issue a commit and-quit. A short time later, users start complaining about network problems. Which commands (in order) need to be entered to resolve this issue?（）