单项选择题 A technician needs to assign a default subnet mask for a class B network to a network device that was just installed. Which of the following would the technician use?（）

单项选择题 Which of the following describes the 25 or 9 pin connector with male pins on the back of a laptop computer?（）

单项选择题 A technician notices that there is a second partition on the primary hard drive. This partitionis notassigned a drive letter and is not accessible from Windows. Which of the following is the MOST likely explanation for this extra partition?（）