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CompTIA A+ Certification Exam: Core 1 Sample Questions (Q474-Q479):

NEW QUESTION # 474
A developer is requesting permission to utilize client-side virtualization. The developer would like to write code in a setting isolated from other infrastructure to avoid negative impacts of experimental code. Which of the following provides the best solution for the developer?

A. Sandbox environment
B. Cross-platform functionality
C. Test case development
D. Software compatibility

Answer: A

Explanation:
Explanation
The best solution for the developer is D. Sandbox environment.
Client-side virtualization is a technology that allows users to run multiple operating systems and applications on the same device, without affecting the host system or the network1. A sandbox environment is a type of client-side virtualization that creates a secure and isolated space for testing, debugging, or experimenting with code, without risking any damage or interference to the rest of the system2.
A sandbox environment can provide several benefits for the developer, such as23:
*It can simulate different scenarios and conditions for the code, such as different operating systems, browsers, devices, network settings, etc.
*It can protect the code from external threats, such as malware, hackers, or unauthorized access.
*It can prevent the code from affecting other applications or processes on the device or the network, such as consuming resources, causing errors, or leaking data.
*It can allow the developer to easily revert any changes or restore the original state of the system, if something goes wrong.
Therefore, a sandbox environment can provide the best solution for the developer who wants to write code in a setting isolated from other infrastructure to avoid negative impacts of experimental code.
References:
1: Client-side Virtualization - CompTIA A+ 220-1001 - 4.2
2: What is a Sandbox Environment? | VMware Glossary
3: What is Sandbox Testing? - Definition from Techopedia

NEW QUESTION # 475
A user failed to gain access to a building's entrance after security measures at the entrance were upgraded last week. The company implemented the 13.56MHz frequency short band, and users can now utilize their mobile devices to authenticate. Which of the following has to be enabled for the mobile device to authenticate?

A. Biometrics
B. Bluetooth
C. PIN
D. NFC

Answer: D

Explanation:
NFC (Near Field Communication) is a technology used for short-range wireless communication between devices, typically used for contactless payments and authentication. In this scenario, the 13.56MHz frequency short band was implemented, and users can authenticate using their mobile devices, which requires NFC to be enabled on the device. Reference: CompTIA A+ Certification Exam Objectives 220-1001 - Mobile device network and device synchronization - 4.4

NEW QUESTION # 476
Which of the following cloud-computing concepts describes an application that is hosted on the internet but can be used and configured as needed internally per organization?

A. Public cloud
B. laaS
C. SaaS
D. Hybrid cloud
E. PaaS

Answer: E

Explanation:
Explanation
Platform as a service (PaaS) is a cloud-computing concept that describes an application that is hosted on the internet but can be used and configured as needed internally per organization. PaaS provides a platform for developing, testing, deploying, and managing applications without having to maintain the underlying infrastructure or software. Hybrid cloud is a combination of public and private cloud services that share data and resources. Public cloud is a cloud computing model that provides services and resources to anyone over the internet. Infrastructure as a service (IaaS) is a cloud computing model that provides servers, storage, networking, and software over the internet

NEW QUESTION # 477
A technician is troubleshooting a wireless network issue. The users are all connected to the network, but the throughput is slow, and connections often drop. Which of the following should the technician check first?

A. Encryption cipher
B. Antenna type
C. Number of connected devices
D. Channel interference

Answer: D

Explanation:
The first thing that the technician should check when troubleshooting a wireless network issue with slow throughput and frequent connection drops is the channel interference. Channel interference is a common cause of poor Wi-Fi performance, as it occurs when multiple wireless networks or devices use the same or overlapping frequency bands, resulting in signal degradation, congestion, or collision. Channel interference can affect both 2.4 GHz and 5 GHz networks, but it is more likely to happen on the 2.4 GHz band, as it has fewer and narrower channels than the 5 GHz band.
To check for channel interference, the technician can use a Wi-Fi analyzer tool, such as the ones found in the web search results123, to scan the wireless environment and identify the best channel to use for the network. A Wi-Fi analyzer tool can display various information, such as the network name (SSID), signal strength (RSSI), channel number, frequency, bandwidth, and security type. The technician can look for the following indicators of channel interference:
* High network density: If there are many wireless networks or devices in the vicinity, they may compete for the same or adjacent channels, causing interference and congestion. The technician can look for the number of networks or devices on each channel and avoid the crowded ones.
* Channel overlap: If there are wireless networks or devices that use the same or partially overlapping channels, they may interfere with each other and degrade the signal quality. The technician can look for the channel width and frequency of each network and avoid the overlapping ones. For example, on the
2.4 GHz band, the technician should use only the non-overlapping channels 1, 6, and 11, and avoid the channels in between.
* Signal interference: If there are other sources of electromagnetic radiation or noise that operate on the same or similar frequency bands as the wireless network, they may interfere with the wireless signals and cause distortion or loss. The technician can look for the signal strength and quality of each network and avoid the ones that are weak or noisy. For example, some common sources of signal interference are microwave ovens, cordless phones, Bluetooth devices, or baby monitors.
To fix the channel interference issue, the technician can try the following solutions:
* Change the channel of the wireless network: The technician can use the Wi-Fi analyzer tool to find the least congested and most optimal channel for the network, and then change the channel settings on the router or the access point. The technician should also consider using the 5 GHz band instead of the 2.4 GHz band, as it offers more and wider channels and less interference.
* Relocate the router or the access point: The technician can move the router or the access point to a different location, away from potential sources of interference or obstacles that may block or weaken the wireless signals, such as walls, furniture, or metal objects. The technician should also place the router or the access point in a central and elevated position, to provide better coverage and signal quality for the network.
* Upgrade the router or the access point: The technician can replace the router or the access point with a newer and more advanced model, that supports the latest Wi-Fi standards, such as Wi-Fi 6 (802.11ax) or Wi-Fi 5 (802.11ac). These standards offer higher data rates, lower latency, and better performance in dense and noisy environments, compared to the older standards, such as Wi-Fi 4 (802.11n) or Wi-Fi 3 (802.11g).
References:
* How to Fix Wi-Fi Connection Drops - Lifewire4
* How to Fix When Wi-Fi Keeps Disconnecting on Windows 115
* How to Fix Wi-Fi Connection Drops - Lifewire6
* How to Fix Wi-Fi Connection Drops - Lifewire7
* How to Fix Wi-Fi Connection Drops - Lifewire8

NEW QUESTION # 478
A customer has a Wi-Fi-capable laptop to use when traveling for work Which of the following will allow the laptop to stay connected when the user travels?

A. Wi-Fi extender
B. Bluetooth
C. GPS
D. Cellular card

Answer: D

Explanation:
A cellular card is a device that allows a laptop to connect to the internet using a cellular network, such as 4G or 5G. A cellular card can provide internet access when the user travels and does not have access to a Wi-Fi network. A cellular card may require a subscription plan from a cellular service provider. A Wi-Fi extender is a device that boosts the signal of an existing Wi-Fi network, but it does not provide internet access by itself. Bluetooth is a wireless technology that allows devices to communicate over short distances, but it does not provide internet access either. GPS is a satellite-based system that provides location and navigation information, but it does not provide internet access as well. Reference: https://www.comptia.org/blog/what-is-a-cellular-card

NEW QUESTION # 479
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220-1101 PDF Download - Latest 220-1101 Exam Online

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CompTIA A+ Certification Exam: Core 1 Sample Questions (Q474-Q479):

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