单项选择题
A. Upgraded copper lines allow maximum speed greater than cable
B. Signal is not shared back to the switch
C. Signal is shared back to the switch
D. Distance is not a factor in signal speed
单项选择题 Which of the following connector types does CAT5e require to connect it from a PC to a switch or router?（）
单项选择题 A technician is dispatched to install additional RAM in a computer. The technician unplugs thesystem from the power source, and removes the cover of the PC. Which of the following shouldthe technician do NEXT?（）
单项选择题 A technician is dispatched to a location. While working, the technician’s cell phone rings. Which of the following actions should the technician take?（）