多项选择题

When a computer does not recognize an internal modem， a technician should determine whether：（）

A.the modem is seated properly.
B.the number being dialed is valid.
C.there are resource conflicts.
D.there is power to the modem.
E.the modem speaker is enabled.

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单项选择题

Which of the following will help protect an operating system from vulnerability？（）

A.Download free anti-virus programs from the Internet.
B.Perform updates from the manufacturers website regularly.
C.Using the operating systems email program only to open attachments.
D.Monitoring what is displayed on the screen.

单项选择题

Which of the following RAID configurations takes advantage of mirroring？（）

A.RAID 1
B.RAID 5
C.RAID 0
D.RAID 2

多项选择题

Which of the following should be considered when upgrading memory？（）

A.speed of memory
B.memory slot color
C.type of memory
D.CPU speed
E.BIOS version