单项选择题

Which test checks the transmitter and receiver of a local modem？（）

A.data parity
B.analog loop back
C.local digital loop back
D.remote digital loop back

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单项选择题

A computer boots up with the error "CMOS Checksum Failure." Which of the following components needs to be replaced？（）

A.power supply
B.CMOS chip
C.motherboard
D.CMOS battery

单项选择题

An A+ Certified Technician MUST do an install on a Windows XP system from the distribution CD. However， the system does not boot from this CD. What is the MOST likely cause of this problem？（）

A.The CD is defective.
B.The CD is not bootable.
C.The CD-ROM drive is defective.
D.The Boot Sequence is not set in the BIOS to boot first from the CD

单项选择题

Which of the following is NOT a phase of the troubleshooting process？（）

A.confirm the repair
B.define the problem
C.document the results
D.simplify the problem