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CompTIA A+ Practice Tests. Docter Quentin

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Автор: Docter Quentin
Издательство: John Wiley & Sons Limited
Серия:
Жанр произведения: Зарубежная образовательная литература
Год издания: 0
isbn: 9781119372677
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rate

      B. Frame rate

      C. Aspect ratio

      D. Resolution

      19 You have three hard disks, each 1TB in size. After installing them as a RAID 5 array in a computer, how much usable storage space will you have?

      A. 1.5TB

      B. 2TB

      C. 2.5TB

      D. 3TB

      20 Which of the following statements most accurately describes the functionality of the disable execute bit?

      A. It prevents the CPU from working if the computer is stolen.

      B. It prevents the CPU from working if the CPU has been set to run at too high a speed (overclocking).

      C. It prevents the computer from being booted remotely in a PXE boot environment.

      D. It protects the computer from certain types of viruses or malicious code.

      21 You need to enable clients to print to your networked printers, regardless of their location worldwide. Which service will best suit your needs?

      A. Bonjour

      B. AirPrint

      C. Virtual printing

      D. Cloud printing

      22 Identify the computer component shown here.

Photograph shows equipment with combination of fiber in black color and metal in white color at each end, three different colors of wires are attached to the black part of instrument.

      A. CPU heat sink and fan

      B. Passive CPU heat sink

      C. Power supply fan

      D. Secondary cooling fan

      23 Which of the following connectors transmit analog signals? (Choose two.)

      A. VGA

      B. RJ-45

      C. RJ-11

      D. HDMI

      24 A business partner who is visiting your corporate office wants to print to a printer using a Bluetooth connection. What type of connection is this?

      A. Permanent

      B. Ad hoc

      C. On demand

      D. Infrastructure

      25 You have a motherboard that supports up-plugging. Which of the following statements regarding PCIe are true? (Choose two.)

      A. You can put an x1 card into an x8 slot.

      B. You can put an x8 card into an x16 slot.

      C. You can put an x8 card into an x1 slot.

      D. You can put an x16 card into an x8 slot.

      26 A technician needs to increase the fault tolerance of his computer’s storage system, and he has two hard drives available. Which of the following options is his best choice?

      A. Install both drives and configure them as separate volumes.

      B. Install both drives and implement RAID 0.

      C. Install both drives and implement RAID 1.

      D. Install both drives and implement RAID 5.

      27 During which step of the laser printer imaging process does a fluorescent lamp discharge the photosensitive drum?

      A. Cleaning

      B. Charging

      C. Exposing

      D. Developing

      28 Which type of laptop monitor technology uses a current of electricity to stimulate a sealed panel of inert gas?

      A. OLED

      B. LED

      C. Plasma

      D. LCD

      29 What type of front- or top-panel connector uses a standard 3.5mm jack to make connections?

      A. USB

      B. Audio

      C. FireWire

      D. Thunderbolt

      30 The motherboard in your desktop computer supports dual-channel memory. Which of the following statements regarding RAM is true?

      A. The RAM will work only if it’s installed in pairs.

      B. The RAM will work only if it’s installed in pairs or if one double-sided RAM module is used.

      C. The RAM will work if only one module is installed, but only at half of its rated speed.

      D. The RAM will work if only one module is installed.

      31 A single lane of PCIe 4.0 operates at what data rate?

      A. 250MBps

      B. 500MBps

      C. 1GBps

      D. 2GBps

      32 A technician needs to replace a failed power supply in a desktop computer. When choosing a replacement power supply, which two specifications are most important to consider? (Choose two.)

      A. Wattage

      B. Dual rail

      C. Dual voltage options

      D. Number of connectors

      33 What is an advantage of using double-sided memory over single-sided memory?

      A. It allows the memory to operate twice as fast.

      B. It allows the CPU to access twice as much RAM at one time.

      C. It’s required for use in dual-channel motherboards.

      D. It allows for twice as much memory to be used in the same amount of space.

      34 You need to replace the magnetic hard drive in your manager’s laptop. She wants a high-speed, high-capacity drive. What are the most common issues associated with her request? (Choose two.)

      A. Increased battery usage

      B. Increased heat production

      C. Decreased component lifespan

      D. Decreased space for other peripherals

      35 What are the two speeds at which PCI expansion buses can operate in desktop computers? (Choose two.)

      A. 33MHz

      B. 66MHz

      C. 133MHz

      D. 266MHz

      36 A designer from the corporate office is visiting your field office. He tries to print from his MacBook Pro to a networked printer, but it does not work. Local users in the office are able to print to the device using their Windows 8 computers. What would most likely solve the problem?

      A. Select the Enable Mac Printing option in the print server configuration settings.

      B.

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<p>19</p>

B. In a RAID 5 array, each stripe places data on n– 1 disks, and parity computed from the data is placed on the remaining disk. The parity is interleaved across all the drives in the array so that neighboring stripes have parity on different disks. Said differently, you lose the equivalent of one hard disk worth of storage to hold the parity information.

<p>20</p>

D. The disable execute bit allows for the CPU to set aside an area of memory and refuse to execute any code placed into that memory location. Oftentimes this serves as a buffer area. The result is that malicious buffer overrun attacks are less likely to succeed.

<p>21</p>

D. Cloud printing allows for printing to a remote device, one that is not necessarily located on your local network. Essentially, you are using the Internet to send the print job from your device to the printer from which you want the output to come, and the printer can be located practically anywhere in the world.

<p>22</p>

A. Heat sinks are often made of metal, with many fins on them to increase surface area and dissipate heat faster. Many modern CPU heat sinks will have both a fan (which requires power) and the finned metal heat sink.

<p>23</p>

A, C. VGA is an analog video connector, and RJ-11 connectors are used with modems. Modems receive a digital signal from the computer but then modulate that signal to analog to transmit over common phone lines.

<p>24</p>

B. Wi-Fi and Bluetooth can be used to connect a printer temporarily to a single computer (or mobile device), and the connection does not have permanent status. This type of configuration is known as an ad hoc network connection.

<p>25</p>

A, B. With up-plugging, you can put a smaller PCIe card into a larger slot, even though it does not fill it up completely. For example, you can insert an x8 card into an x16 slot. The x8 card won’t completely fill the slot, but it will work at x8 speeds.

<p>26</p>

C. RAID 1 is called disk mirroring; it writes data simultaneously to both drives. If one drive fails, the other still has a working copy of the data. RAID 0 is disk striping and does not provide fault tolerance. RAID 5 is striping with parity and provides fault tolerance, but it requires three hard disks.

<p>27</p>

A. During the cleaning step, a rubber blade inside the toner cartridge scrapes any toner left on the drum into a used toner receptacle, and a fluorescent lamp discharges any remaining charge on the imaging drum. (Remember that the drum, being photosensitive, loses its charge when exposed to light.)

<p>28</p>

C. Plasma displays place electrodes in front of and behind sealed chambers full of inert gas (such as neon) and vaporized mercury. Current is run through the gas to ionize it and cause it to light up.

<p>29</p>

B. The audio connector on the front or top panel will use a round, 3.5mm connector. You can plug speakers or headphones into it.

<p>30</p>

D. With most dual-channel motherboards, RAM will work just fine if one module is installed. However, you will get better performance if you fill the entire bank.

<p>31</p>

D. There are four major versions of PCIe currently specified: 1.x, 2.x, 3.0, and 4.0. For the four versions, a single omnidirectional lane operates at a data rate of 250MBps, 500MBps, approximately 1GBps, and roughly 2GBps, respectively.

<p>32</p>

A, D. When installing or replacing a power supply, always make sure that it has enough wattage to power the components in the computer. In addition, it should have enough connectors to connect to all the components that require their own power. Dual rail and dual voltage are optional features.

<p>33</p>

D. Double-sided memory has chips on both sides of the RAM module instead of just on one side. It allows for doubling the amount of RAM on the module, so you get twice as much memory on one stick.

<p>34</p>

A, B. Faster hard drives transfer more data than slower hard drives, but there is no specific correlation between hard drive speed and its lifespan. The downsides to faster hard drives can be increased battery usage and heat production.

<p>35</p>

A, B. PCI expansion buses operate at 33MHz or 66MHz (version 2.1) over a 32-bit (4-byte) channel, resulting in data rates of 133MBps and 266MBps, respectively, with 133MBps being the most common, server architectures excluded.

<p>36</p>

C. Print servers need to have the appropriate drivers for all operating systems that will be clients. It’s possible that this print server does not have the Mac driver installed.