单项选择题 When attempting to boot a PC, the POST process completes without error. The PC then displays,‘non system disk or disk error’. Which of the following would MOST likely cause the issue?（）

单项选择题 Which of the following switches in Windows can be used to ping a host until stopped?（）

单项选择题 A technician installs a local web server which is not accessible from the network. Which of the following is the local IP address that the web server should be using on the loopback adapter?（）