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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Security | 28% | - Security fundamentals
|
| Topic 2: Operational Procedures | 21% | - Safety and compliance
|
| Topic 3: Operating Systems | 28% | - File systems and maintenance
|
| Topic 4: Software Troubleshooting | 23% | - Mobile and application troubleshooting
|
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질문 # 135
A technician is deploying mobile devices and needs to prevent access to sensitive data if the devices are lost. Which of the following is the best way to prevent unauthorized access if the user is unaware that the phone is lost?
정답：C
설명：
Full-disk (or device) encryption ensures that, even if a lost mobile device is physically accessed by an unauthorized party, its stored data remains inaccessible without the correct decryption credentials. This protection is automatic and continuous, safeguarding data at rest regardless of whether the user realizes the device is missing or not. Remote wipe can remove data if triggered, but it requires the device to be online and the user (or admin) to initiate the wipe--whereas encryption is always in effect.
질문 # 136
A user keeps seeing malicious ads in the bottom right corner of their screen. When the ads appear, the icon for the internet browser process is visible in Task Manager. A technician runs an anti-malware scan that shows no results. Which of the following is the cause of this issue?
정답：A
설명：
Browser notifications can display pop-up ads from websites even when no malware is detected.
Since the browser process is associated with the ads, the issue is most likely caused by notification permissions granted to a malicious or unwanted website.
질문 # 137
A user ' s new smartphone is not staying charged throughout the day. The smartphone charges fully every night. Which of the following should a technician review first to troubleshoot the issue?
정답：C
설명：
Background applications can significantly drain a smartphone's battery, even when the device is idle. A technician should first review which apps are running in the background and consuming power through the battery usage section of the OS. Disabling or restricting power-hungry apps often resolves poor battery life.
A). Storage usage doesn't significantly affect battery life.
B). End of software support is unrelated to battery performance unless it ' s causing inefficient processes, which would still be secondary.
C). Charger wattage affects charging speed, not battery life after charging.
Reference:
CompTIA A+ 220-1102 Objective 3.3: Troubleshoot common mobile OS and application issues.
Study Guide Section: Diagnosing battery and app performance issues on mobile devices
질문 # 138
A company requires technicians to verify that files downloaded from the internet have not been modified.
Which of the following should the technicians use for validation?
정답：A
설명：
The correct answer is A. Hashing, because hashing is specifically designed to verify file integrity and detect whether a file has been altered after its original creation or distribution. A hash is a fixed-length value generated by running a file through a hashing algorithm such as SHA-256 or SHA-1. Even a single-bit change in the file will produce a completely different hash value.
According to the Quentin Docter - CompTIA A+ Complete Study Guide, hashing is commonly used to validate downloaded software by comparing the calculated hash of the downloaded file with the hash published by the vendor. If the two values match, the technician can be confident that the file has not been modified or tampered with.
The Travis Everett & Andrew Hutz - All-in-One Exam Guide emphasizes that hashing ensures integrity, not confidentiality or authentication. SSL certificates secure data in transit, but they do not validate files after download. Plug-ins and extensions provide additional browser functionality but have no role in verifying file integrity.
The Mike Meyers / Mark Soper Lab Manual reinforces that hashing is a standard best practice in secure software deployment and malware prevention. It allows technicians to confirm that files are exactly as the publisher intended.
Because the requirement is to confirm that files have not been modified, hashing is the correct and most reliable method, making A the correct answer.
질문 # 139
Which of the following commands is used to manage files in a Linux OS?
정답：C
설명：
The cp command in Linux is used to copy and manage files and directories within the file system.
It is a standard Linux utility for file management operations.
질문 # 140
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