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Sandbox testing is a method of identifying potential issues with a proposed change prior to implementation. It involves creating a simulated or isolated environment that mimics the real system and applying the change to it. This can help to verify that the change works as expected and does not cause any errors or conflicts. Request form, rollback plan and end-user acceptance are other components of a change management process, but they do not involve identifying issues with a change. Verified References:

Detailed Explanation with Core 2 References:The PC is likely infected with ransomware. The immediate step should be to disconnect from the network to prevent the malware from spreading to other devices. Core 2 highlights steps to respond to malware incidents, such as disconnecting from the network as part of containment measures (Core 2 Objective 2.3)​.

When a customer is having difficulty accessing the company’s website, the technician should first document the issue in the company’s ticketing system. This step ensures that the problem is officially logged, which allows for proper tracking, prioritization, and assignment to the appropriate personnel if needed. Recording the details helps in maintaining a record of the issue and the troubleshooting steps taken, which is useful for future reference and analysis.

A. Ask the customer for their log-in credentials. This is not appropriate as it breaches security protocols and is not the first step in troubleshooting.

B. Check the company's internal knowledge base for solutions. While useful, this step comes after the issue has been documented.

C. Refer the customer to a more experienced technician. This might be necessary later, but initially, the issue should be documented.

References:

CompTIA A+ Core 2 (220-1102) Exam Objectives, Section 4.1: Documentation and support systems, including the use of ticketing systems for tracking incidents​​.

Detailed Explanation with Core 2 References:SSH allows for remote access to systems securely and discretely, suitable for verifying patch levels and other administrative tasks. This meets Core 2 objectives on using secure remote access tools (Core 2 Objective 4.9)​.