单项选择题 An administrator wants to prevent users from plugging in their personal laptops and accessing the Internet without a member of the IT staff configuring the machine first. Which of the following would MOST likely be installed?（）

单项选择题 Which of the following tools would an administrator BEST use to trace a network cable?（）

单项选择题 The helpdesk is receiving calls about the corporate web server being down. Which of the followingshould be taken NEXT after verifying that the server is unreachable?（）