单项选择题 Which of the following would help a new administrator quickly determine if a network had a VLANfor its publicly accessible servers?（）

单项选择题 Which of the following network devices should be installed at a data center to intelligently distribute client connections to a pool of servers?（）

单项选择题 Which of the following attacks occurs when a hijacker intercepts traffic, modifies it, then sends thetraffic?（）