CompTIA A+ Operating Systems and Troubleshooting

By Jordan Blake · Updated May 25, 2026

Questions23
Passing Score75%
Format65% Multiple Choice
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Question catalog for this preview

Catalog listing of the 5 preview questions for this quiz.

Question 1

The Windows Registry is a hierarchical database that stores configuration settings for the OS, hardware, applications, and user preferences.

Answer choices

  • A. True

  • B. False

Question 2

A macOS user reports their Mac runs slowly after upgrading to the latest macOS version. Activity Monitor shows kernel_task consuming 100%+ of CPU. What is the MOST accurate explanation?

Answer choices

  • A. The Mac has a virus infecting the kernel process

  • B. kernel_task is artificially throttling CPU performance to manage thermal output

  • C. The upgrade corrupted the kernel and the OS must be reinstalled

  • D. kernel_task always runs at 100% CPU on modern Macs during boot

Question 3

Place the following steps in the correct order for the CompTIA A+ troubleshooting methodology:

1. Document findings, actions, and outcomes

2. Identify the problem (gather information, question the user)

3. Implement the solution or escalate

4. Establish a theory of probable cause

5. Verify full system functionality and apply preventive measures

6. Test the theory to determine the cause

7. Establish a plan of action to resolve the problem

Answer choices

  • A. Document findings, actions, and outcomes

  • B. Identify the problem (gather information, question the user)

  • C. Implement the solution or escalate

  • D. Establish a theory of probable cause

  • E. Verify full system functionality and apply preventive measures

  • F. Test the theory to determine the cause

  • G. Establish a plan of action to resolve the problem

Question 4

What is the purpose of the Windows command `ipconfig /flushdns`?

Answer choices

  • A. Releases and renews the DHCP IP address lease

  • B. Clears the local DNS resolver cache stored on the computer

  • C. Flushes the TCP connection table

  • D. Resets the Windows Firewall DNS rules

Question 5

A technician discovers a Windows 10 workstation is infected with ransomware that has encrypted user files. The computer is still running. What should the technician do FIRST?

Answer choices

  • A. Run antivirus software to remove the ransomware

  • B. Pay the ransom to get the decryption key

  • C. Immediately disconnect the computer from the network to prevent spread

  • D. Restore files from backup before removing the malware