单项选择题 Which of the following devices is used to move frames between a source and destination basedon a MAC address?（）

单项选择题 A technician replaces a user’s 15 inch LCD with a 20 inch LCD. Later, the user informs thetechnician that icons are very large and the text on the monitor is fuzzy and distorted. Which of the following is MOST likely the cause?（）

单项选择题 Which of the following malicious software types will create multiple pop-ups on a computer?（）