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CompTia A+ Core 1 2024/25 Newest with complete solution RATED A+
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CompTia A+ Core 1 2024/25 Newest with complete solution RATED A+
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CompTia A+ Core 1 2024/25 Newest withcomplete solution RATED A+
"multiple input multiple output" (MIMO) - Correct Answers Use of multiple reception and
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transmission antennas to boost wireless bandwidth via spatial multiplexing and to boost
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range and signal reliability via spatial diversity.
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"orthogonal frequency division multiple access" (OFDMA) - Correct Answers Feature of
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Wi-Fi 6 allowing an access point to serve multiple client stations simultaneously.
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"unshielded twisted pair (UTP) - Correct Answers Media type that uses copper
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conductors arranged in pairs that are twisted to reduce interference. Typically, cables are
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4-pair or 2-pair.
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3-D printer - Correct Answers Hardware device capable of small-scale manufacturing.
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Most 3-D printers use either a variety of filament (typically plastic) or resin media with
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different properties.
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802.11 standards - Correct Answers Specifications developed by IEEE for wireless
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networking over microwave radio transmission in the 2.4 GHz, 5 GHz, and 6 GHz
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frequency bands. The Wi-Fi standards brand has six main iterations: a, b, g, Wi-Fi 4 (n),
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Wi-Fi 5 (ac), and Wi-Fi 6 (ax). These specify different modulation techniques, supported
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distances, and data rates, plus special features, such as channel bonding, MIMO, and MU-
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MIMO.
802.3 Ethernet - Correct Answers Standards developed as the IEEE 802.3 series
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describing media types, access methods, data rates, and distance limitations at OSI layers
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1 and 2 using xBASE-y designations.
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A cloud service provides a billing dashboard that reports the uptime, disk usage, and
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network bandwidth consumption of a virtual machine. What type of cloud characteristic
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does this demonstrate? - Correct Answers Metered utilization.
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A company has contracted the use of a remote datacenter to offer exclusive access to
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platform as a service resources to its internal business users. How would such a cloud
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solution be classed? - Correct Answers As a private deployment model.
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A company has discovered that an employee has been emailing product design
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documents to her smartphone and then saving the files to the smartphone's flash drive.
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Which technology can be deployed to prevent such policy breaches? - Correct Answers
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Mobile application management (MAM) allows an enterprise to create a protected
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container as a workspace for corporate apps and data and prevent copying to other
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storage areas.
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, A company is ordering custom-built laptops to supply to its field sales staff for use
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predominantly as presentation devices. The company can specify the type of panel used
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and has ruled out IPS and OLED on cost grounds. Which of the remaining mainstream
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display technologies is best suited to the requirement? - Correct Answers Vertical
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alignment (VA) displays support good viewing angles and high-contrast ratios, which
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makes them well-suited to displaying slides to an audience. The twisted nematic (TN) type
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is cheap but does not support wide-angle viewing.
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A firewall filters applications based on their port number. If you want to configure a firewall
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on a mail server to allow clients to download email messages, which port(s) might you
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have to open? - Correct Answers Either TCP port 993 (IMAPS) or 995 (POP3S),
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depending on the mail access protocol in use (IMAP or POP). These are the default ports
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for secure connections. Unsecure default ports are TCP port 143 and TCP port 110. Port
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25 (SMTP) is used to send mail between servers and not to access messages stored on a
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server. Port 587 is often used by a client to submit messages for delivery by an SMTP
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server.
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A host is configured with the IP address 172.16.1.100 in the 172.16.1.0/16 IP network.
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What value should be entered as the subnet mask? - Correct Answers A subnet mask
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field uses dotted decimal format. The /16 network prefix means that the first 16 bits in the
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mask are set to one: 11111111 11111111 00000000 00000000. A whole octet of ones
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converts to 255 in decimal. Therefore, the dotted decimal mask is 255.255.0.0.
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A laptop user is complaining about typing on their new laptop. They claim that the cursor
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jumps randomly from place to place. What might be the cause of this? - Correct Answers
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The user could be touching the touchpad while typing, or vibrations could be affecting the
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touchpad. Update the driver or reduce the sensitivity/disable touch and tap events.
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A laptop user reports that they are only getting about two hours of use out of the battery
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compared to about three hours when the laptop was first supplied to them. What do you
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suggest? - Correct Answers Batteries lose maximum charge over time. It may be
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possible to recondition the battery or to use power-saving features, but the only real way to
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restore maximum battery life is to buy a new battery.
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A laser printer is producing white stripes on the paper. What could be causing this? -
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Correct Answers Poorly distributed toner or a damaged/worn transfer corona wire. If the
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secondary corona does not apply a charge evenly across the paper, less toner is attracted
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from the drum to the part of the sheet where charging failed. Note that if there are repetitive
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white or black marks (rather than stripes) that do not smudge, the issue is more likely to be
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dirt or grease on the drum.
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A network consultant is recommending the use of S/FTP to extend a cable segment
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through a factory. Is this likely to be an appropriate cable choice? - Correct Answers Yes.
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Shielded/foiled twisted pair (S/FTP) will provide the best protection from the external
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interference sources likely to be generated by factory machinery.
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, A network owner has configured three web servers to host a website. What device can be
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deployed to allow them to work together to service client requests more quickly? - Correct
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Answers A load balancer.
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A network uses an IEEE 802.11 standard to establish connections. What type of network
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is this? - Correct Answers A wireless local area network (WLAN).
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A probe reports that the Internet connection has RTT latency of 200 ms. What is the likely
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impact on VoIP call quality? - Correct Answers Most vendors recommend that one-way
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latency should not exceed 150 ms. Round trip time (RTT) measures two-way latency, so
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200 ms is within the recommended 300 ms tolerance. Call quality should not be severely
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impacted, but if latency is persistently that high, it might be worth investigating the cause.
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A technician connects a single port on a graphics card to two monitors using two cables.
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What type of interface is being used? - Correct Answers Both DisplayPort and
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Thunderbolt interfaces support this type of daisy-chaining.
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A technician has removed an adapter card from a PC. Should the technician obtain and
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install a blanking plate to complete the service operation? - Correct Answers Yes. The
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fan system is designed to draw cool air across the motherboard and blow out warm air.
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Large holes in the chassis disrupt this air flow. Also, dust will be able to settle on the system
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components more easily. A blanking plate covers the empty slot in the case.
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A technician is completing a storage upgrade on an older computer. Examining the power
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supply, the technician notices that only two of the five plugs of the type shown in the exhibit
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are connected to devices. What is the purpose of these plugs, and can some be left
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unconnected? - Correct Answers A Molex cable is a power cable used for storage
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devices that require more power than can be supplied over most internal bus types.
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Unused connectors do not pose any problem (though they should be secured with cable
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ties to minimize disruption to air flow). Note that Molex is a legacy connector format. Most
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drives use SATA power connectors these days.
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A technician is performing a keyboard replacement and asks for your help. The data cable
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for the old keyboard will not pull out. How should it be removed? - Correct Answers This
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type of flat data connector is secured by a latch. Pop the latch up before trying to remove
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the cable.
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A technician provisions a network of virtual machines running web server, scripting
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environment, and database software for use by programmers working for the sales and
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marketing department. What type of cloud model has been deployed? - Correct Answers
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This is a platform as a service (PaaS) model. Infrastructure as a service (IaaS) would only
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provision the VMs and network without the software. It is not software as a service (SaaS)
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because the web server and database come without applications.
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, A thermal printer used to create labels for parts bins, kits, and boxes is jammed due to a
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label coming loose during printing. How should you resolve this problem? - Correct
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Answers Open the printer and locate the label that came off the backing. Remove the
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label, and if there is any sticky residue, clean it with isopropyl alcohol (IPA) applied to a
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swab. Ensure the roll of labels is properly loaded and that there are no loose labels that
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might come loose again.
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A user complains that their Bluetooth keyboard, which has worked for the last year, has
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stopped functioning. What would you suggest is the problem? - Correct Answers The
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batteries in the keyboard have run down—replace them.
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A user has a monitor that was stored in the storage room as a temporary replacement.
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Upon connecting the monitor to the desktop, the user declares that a thick green band runs
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across the middle of the screen, making it unusable. To troubleshoot, the user connects
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the desktop to a neighboring monitor and it works without issue. What technique could you
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use to diagnose the cause? - Correct Answers Replace the cable with a known good one.
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If this does not solve the problem, suspect an issue with the monitor. As the PC was used
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with no issues with another monitor, there is not likely to be an issue with the video card.
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A user reports hearing noises from the hard disk—does this indicate it is failing and should
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be replaced? - Correct Answers Not necessarily. Hard disks do make noises, but they
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are not all indicators of a problem. Question the user to find out what sort of noises are
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occurring or inspect the system yourself.
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A user reports that a "Limited connectivity" desktop notification is displayed on their
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computer, and they cannot connect to the Internet. Will you need to replace the NIC in the
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computer? - Correct Answers No. Limited connectivity reported by the OS means that
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the link has been established, but the host has not been able to contact a DHCP server to
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obtain a lease for a valid configuration.
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A user reports that the Internet is slow. What first step should you take to identify the
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problem? - Correct Answers Verify the link speed independently of user apps, such as
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web browsing, to determine if there is a cable or port problem.
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A user reports that the printed output is not up to the usual standards for their printer. You
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will need to resolve this issue so they can print their report. What is the overall process for
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troubleshooting this issue? - Correct Answers Print out a test page to see if you can
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reproduce the problem the user reported. If you see the same problem as reported by the
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user, identify the print defect, based on the type of printer, to resolve the problem.
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Document the steps you took to resolve the problem.
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A user reports that there is a loud clicking noise when she tries to save a file. What should
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be your first troubleshooting step? - Correct Answers Determine whether a data backup
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has been made. If not, try to make one.
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