单项选择题
A. Screensaver changed on its own
B. Unauthorized outgoing emails being sent
C. Desktop background changed on its own
D. Left and right mouse buttons have been flipped
单项选择题 Users in the office report that the speed of the Internet has drastically decreased since the recent network hardware refresh. Which of the following could be attributed to the problem?（）
多项选择题 For added security, a network administrator has decided to lock down the wireless network. Which of the following are ways to accomplish this? （）(Select TWO).
单项选择题 Which of the following IP addresses would MOST likely be the default gateway for 10.1.16.184?（）