单项选择题 Users have stated that all their printouts from a networked printer consist of random characters.The technician should:（）

单项选择题 A user has just installed an application that is causing system instability and lock-ups and is not allowing a clean uninstall. To resolve this issue, the technician should:（）

单项选择题 A technician wants to verify a remote printer that has been power cycled is back online. Thetechnician would use which of the following commands and switch?（）