单项选择题 A technician has a user that consistently picks up viruses and malware no matter what kind ofsoftware is installed to prevent infection. Which of the following should be a cost-effective logical step in preventing future infections?（）

单项选择题 Which of the following commands would be used to verify and troubleshoot DNS settings of aparticular host on a Windows computer?（）

单项选择题 Several users report that they are unable to print to a new printer recently installed. The technician is unable to ping the printer. Which of the following is the MOST likely cause?（）