单项选择题

Which of the following commands will repair boot sector blocks after a virus has been removed?（）

A.chkdsk
B.format
C.fixmbr
D.sfc

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单项选择题

A technician is trying to connect from a home computer to their office computer, but cannotconnect via Remote Desktop. Which of the following ports needs to be open for RDP traffic to be allowed?（）

A.21
B.80
C.443
D.3389

单项选择题

Which of the following should Karen, a technician, use to test a parallel port?（）

A. Line tester
B. Multimeter
C. Null modem cable
D. Loopback plugs

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