单项选择题 A laser printer keeps printing out crumpled pages from the third tray. Which of the following is the MOST likely explanation?（）

单项选择题 A user is attempting to access a website but is getting a ‘Page cannot be displayed’ error. The technician checks the IP address of the computer and sees that it has been assigned 169.254.10.70. Which of the following is the MOST likely cause?（）

单项选择题 A user reports their laptop computer can no longer connect to a server. The computer works correctly in a different office. Which of the following tools would be used to troubleshoot this issue?（）