单项选择题 While using the ping command to try and reach a local server, a technician receives a response of “Destination host unreachable”. After confirming that the PC is physically connected to the network, which of the following commands should the technician use to get more detailed information?（）

单项选择题 Which of the following printer failure symptoms can be described as a condition where the internal feed mechanism has stopped working temporarily?（）

单项选择题 After installing the Windows operating system, Device Manager shows a number of devices with a yellow question mark next to them. Which of the following is the MOST likely reason?（）