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?（）
A. A proxy server B. A load balancer C. A layer two switch D. A multilayer switch
单项选择题 Which of the following attacks occurs when a hijacker intercepts traffic, modifies it, then sends thetraffic?（）
单项选择题 Which of the following is the BEST network device to allow multiple network connections to beterminated in one spot?（）
单项选择题 Which of the following uses TCP?（）
