单项选择题
A. Straight-through cable is used to connect both switches
B. Loopback plug is connected
C. Crossover cable is used to connect both switches
D. Cable is a rollover cable
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?（）
多项选择题 Which of the following ports are used by default for web servers? （）(Select TWO)