单项选择题 Jill, a technician, is installing several PCs in a home that is pre-wired with Ethernet to seven rooms. In the wiring closet all the Ethernet cables are hanging free and are not labeled. Which of the following tools would the technician use to locate the cable that runs to each room?（）

单项选择题 On which of the following hard drive types must Bob, a technician, change the jumper setting to match the motherboard/cabling combination?（）

单项选择题 A department of users is reporting there are lines across their printouts. They have alreadychanged the toner cartridge but the issue remains. Which of the following is the BEST item for Karen, a technician, to inspect?（）