单项选择题

Which of the following default ports must be opened to allow a technician to telnet into a machine?（）

A.21
B.23
C.24
D.25

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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?（）

A. Motherboard
B. Video card
C. Cutoff switch
D. AC adapter

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?（）

A.6
B.7
C.8
D.9

单项选择题

A customer reports to Karen, a technician, that he is experiencing problems with the display after his computer is fully booted but reports seeing the BIOS splash screen during boot. Which of the following would MOST likely be the cause?（）

A. The video cable is incorrectly attached.
B. A corrupted or incorrect video driver is installed.
C. An incorrect video card is installed in the computer.
D. The video card is defective and needs to be replaced.