Explanation
A laptop's battery is the component that provides power to the laptop when it is not connected to an external power source, such as a wall outlet or a docking station. A laptop's battery can wear out over time, losing its capacity and ability to hold a charge. This can cause the laptop to not turn on or shut down unexpectedly when it is not plugged in .
According to some web search results , some signs and symptoms of a failing laptop battery are:
*The laptop does not turn on or turns off suddenly when it is not connected to an external power source
*The laptop shows a low battery warning or a red X over the battery icon even when it is fully charged
*The laptop takes longer to charge or does not charge at all
*The laptop feels hot or the battery bulges or leaks
To fix this issue, the technician should replace the laptop's battery with a new one that is compatible with the laptop model and specifications. The technician should also dispose of the old battery properly, following the environmental and safety guidelines .
Reinstalling the laptop's operating system, enabling a remote desktop account, or issuing a peripheral set for use in the conference room are not effective solutions for this issue, since they do not address the root cause of the problem, which is the faulty battery. Reinstalling the operating system may erase the user's data and settings, and it may not improve the laptop's performance or power management. Enabling a remote desktop account may allow the user to access their files and applications from another device, but it does not solve the problem of the laptop not turning on. Issuing a peripheral set for use in the conference room may provide the user with an external monitor, mouse, and keyboard, but it does not guarantee that the laptop will work without an external power source.

Explanation
Application virtualization is a technique that allows an application to run on a computer without being installed or affecting other applications on the system. Application virtualization creates a virtual environment for the application that isolates it from the underlying operating system and hardware. This way, the technician can verify the application deployment will not affect other legacy applications on the end users' computers.

Explanation
The technician should check that the audio inputs are configured correctly for the videoconference software and that they are not muted or disabled.The technician should also make sure that the microphone is plugged in properly and that it is not faulty or damaged.If possible, the technician should test the microphone on another device or use another microphone on the same device to isolate the problem. Reference:
https://partners.comptia.org/docs/default-source/resources/a-core-1-content-guide (page 11)

Explanation
FTP (File Transfer Protocol) uses TCP ports 20/21 and transfers data in cleartext, which means the data is not encrypted and can be read by anyone who intercepts it. This makes FTP insecure for transferring sensitive information. SSH (Secure Shell), on the other hand, uses port 22 and encrypts data, making it more secure.
SNMP (Simple Network Management Protocol) uses ports 161/162 and is used to monitor network devices.
Telnet uses port 23 and transfers data in cleartext, making it insecure. References: CompTIA A+ Certification Exam: Core 1 - Page 199

Explanation
The best practice methodology for troubleshooting is to follow these steps:
Identify the problem.
Establish a theory of probable cause.
Test the theory to determine cause.
Establish a plan of action to resolve the problem and implement the solution.
Verify full system functionality and implement preventive measures.
Document the findings, actions, and outcomes. Since the technician has already verified full system functionality and implemented preventive measures, the next step is to document the findings, actions, and outcomes. Verified References: CompTIA A+ Certification Exam Objectives, page 8.