121.
What is the modem hang up command?
Answer: B
Correct answer: ATH
ATH hangs up - H for hook, as in on-hook. ATZ resets the modem instead.
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Computer Hardware and Software Questions and Answers
122.
What expansion types do most pll/plll motherboards support?
Answer: C
Correct answer: ISA, PCI, AGP
Pentium II and III boards carry ISA for legacy cards, PCI for general expansion and a single AGP slot for the graphics card. MCA and VESA local bus belong to earlier generations.
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123.
When installing an internal modem, all of the following IRQ's can be used except?
Answer: C
Correct answer: 14
IRQ14 is taken by the primary IDE controller, which is present on every such system, so it is never available for a modem. IRQs 5 and 10 are commonly free.
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124.
An IRQ allow interface cards to:
Answer: A
Correct answer: Interrupt the CPU to request service
An interrupt request line lets a card signal that it needs attention, so the processor can attend to it when it is ready instead of polling. Data itself travels over the bus, not over the IRQ line.
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125.
A workstation has just been installed on an Ethernet LAN, but cannot communicate with the network. What should you check first?
Answer: D
Correct answer: verify the link status on the computer's network card
The link light shows whether there is a working connection to the switch at all. If it is dark, no amount of driver or protocol work will help, so it is checked before anything in software.
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126.
One of the major components of a PC is the Central Processing Unit (CPU) which can be best described as:
Answer: D
Correct answer: The area where all of the processing takes place
The CPU fetches and executes the instructions, which is what processing means. Driving the monitor is the video card's work and regulating power the supply's.
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127.
What is the i/o address for com2?
Answer: B
Correct answer: 2f8
The standard serial addresses are COM1 at 3F8, COM2 at 2F8, COM3 at 3E8 and COM4 at 2E8.
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128.
The ESD wrist strap is designed to protect PC Components or Service Technicians ?
Answer: C
Correct answer: Both
The strap protects the components from the static the technician carries, and the resistor in it protects the technician by limiting the current that could flow to earth through the body.
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129.
You can have EISA and MCA devices in the same PC.
Answer: B
Correct answer: False
EISA and MCA are rival extensions of the PC bus, electrically and mechanically incompatible, so a machine has one or the other. EISA accepts ISA cards; MCA does not.
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130.
The floppy drive uses which DMA (direct memory access) channel?
Answer: D
Correct answer: 2
The floppy controller uses DMA channel 2, which is why that channel is never available for anything else on a machine with a floppy drive.
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