单项选择题 In which of the following topologies could the failure of one machine cause the entire network tostop functioning?（）

单项选择题 Which of the following would be used to lock all of the primary communication equipment of abuilding, including its demarcation point?（）

单项选择题 A technician at a company providing online, real-time media streaming to the Internet needs a network technology that will reduce bandwidth while delivering high throughput. Which of the following can the technician implement to fit these requirements?（）