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 question shows the correct answer and a clear explanation. Ready for the real thing? Take the full timed quiz below.
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.