单项选择题 An administrator is having a hard time adding a new switch to the network. After verifying that allthe ports are configured correctly on each switch, which of the following should the administratorverily NEXT?（）

单项选择题 Which of the following connectivity issues is likely to occur within a token ring network?（）

单项选择题 An administrator is trying to isolate the location of a persistent connectivity problem caused by a faulty NIC. Which of the following diagrams would assist the technician in finding the machine that is causing the problem?（）