XK0-006 Troubleshooting Practice Question
A Linux administrator is troubleshooting a slow system. They decide to use vmstat to get an overall picture. Which two of the following fields in vmstat output are most directly related to CPU performance issues? (Choose two.)
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
sy (system CPU time)
The 'us' field shows user time, 'sy' shows system time, 'id' shows idle, and 'wa' shows I/O wait. High 'us' or 'sy' can indicate CPU-bound issues.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
id (idle time)
Why it's wrong here
Idle indicates free CPU.
- ✗
wa (I/O wait time)
Why it's wrong here
wa indicates wait for I/O, not CPU performance directly.
- ✓
sy (system CPU time)
Why this is correct
High sy indicates CPU is busy with kernel tasks.
- ✗
r (run queue)
Why it's wrong here
r indicates number of processes waiting, but not CPU usage itself.
- ✓
us (user CPU time)
Why this is correct
High us indicates CPU is busy with user processes.
Go deeper
Related to this question
Learn chapter
Linux Fundamentals and History
Key term
Output
In IT service management, output is the result or deliverable produced by a process, system, or component, such as data, reports, or services delivered to a customer.
Key term
Linux
Linux is an open-source operating system that manages computer hardware and software, widely used in servers, desktops, and embedded systems.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This XK0-006 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the XK0-006 exam.