单项选择题 A technician needs to ping a client’s machine that the technician is working on, to ensure that thenetwork card is functioning correctly. Which of the following IP addresses should be used?（）

单项选择题 A technician suspects the AC voltage into a PC power supply is bad. Which of the following toolswould MOST likely be used to confirm the diagnosis?（）

单项选择题 A home user wants to setup a wireless network. Which of the following would be the MOST important consideration?（）