Q1. Which sysctl parameter controls swap aggressiveness?
- A.vm.swappiness✓ Correct
- B.kernel.panic
- C.net.ipv4.tcp_fin_timeout
- D.fs.file-max
Explanation: swappiness=0 minimizes swapping, 100 favors swap. Learn more.
CompTIA Linux+ Practice Questions: Performance
7 free, exam-style CompTIA Linux+ (XK0-006) practice questions covering Performance, each with the correct answer and an explanation. Start a timed exam below, or scroll on to read through the questions.
Performance practice questions
Answers and explanations are shown. Take the timed exam above to test yourself first.
Q2. Which command shows disk I/O statistics?
- A.iostat✓ Correct
- B.vmstat
- C.mpstat
- D.sar
Explanation: iostat reports CPU and disk I/O metrics. Learn more.
Q3. Which command shows memory usage?
- A.free
- B.vmstat
- C.top
- D.All of the above✓ Correct
Explanation: All commands display memory statistics. Learn more.
Q4. What is the purpose of 'tuned-adm'?
- A.Manage performance profiles✓ Correct
- B.Adjust screen brightness
- C.Tune network latency
- D.Optimize database queries
Explanation: Applies predefined tuning profiles for various workloads. Learn more.
Q5. Which command displays processes in real time with resource usage?
- A.top✓ Correct
- B.touch
- C.tee
- D.tr
Explanation: top provides an interactive real-time view of processes and resource consumption. Learn more.
Q6. Which command displays free and used memory in a human-readable format?
- A.free -h✓ Correct
- B.df -i
- C.ip link
- D.userdel -r
Explanation: free -h shows memory usage with human-readable units. Learn more.
Q7. Which command restricts a process to selected CPU cores by setting its CPU affinity?
- A.renice
- B.ionice
- C.ulimit
- D.taskset✓ Correct
Explanation: taskset reads or changes a process CPU affinity mask, controlling which logical processors may run the process. Learn more.
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