单项选择题 A technician is able to connect to the Internet but cannot connect to a remote machine through Remote Desktop in Windows XP. Each time the technician attempts to connect to a remote location, the software times out. Which of the following is the MOST likely problem?（）

单项选择题 A technician is setting up a new inkjet printer and notices that the images appear hazy. Which of the following should the technician perform FIRST to resolve the issue?（）

单项选择题 Which of the following should a technician MOST likely use to test a RS-232 port?（）