单项选择题
A. Verify that the network card is compatible with the operating system.
B. Verify that the port on the switch is enabled.
C. Update the network card driver.
D. Replace the network cable with a crossover cable.
单项选择题 Which of the following default ports must be opened to allow a technician to telnet into a machine?（）
单项选择题 After opening up the lid of a laptop that is powered on, nothing is displayed on the LCD. Opening and closing the lid multiple times usually causes the display to regain the signal. Which of the following components should the technician check FIRST?（）
单项选择题 Which of the following is the number of SCSI devices that can be added to a single narrow SCSI bus?（）