The answer is insufficient physical memory for the workload. High swap usage directly indicates that the system’s active processes are exceeding available RAM, forcing the kernel to page memory to disk. Since disk I/O is orders of magnitude slower than RAM, this paging introduces severe latency, which explains the intermittent slowdowns in the web application. On the CompTIA Linux+ XK0-005 exam, this scenario tests your understanding of memory management and the performance impact of swapping, often appearing in questions about resource monitoring tools like free, vmstat, or top. A common trap is to blame the swap space itself or a misconfiguration, but the root cause is always a RAM shortage relative to the workload—especially when multiple virtual hosts compete for memory. Remember the mnemonic: “Swap is a safety net, not a speed boost; if it’s active, RAM is the culprit.”
XK0-005 Troubleshooting Practice Question
This XK0-005 practice question tests your understanding of troubleshooting. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A Linux administrator receives reports that a web application hosted on the company's internal server is intermittently slow. The server runs CentOS 7 and hosts multiple virtual hosts. The administrator checks system resources and notices that the system's swap usage is high. Which of the following is the MOST likely cause of the performance issue?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Insufficient physical memory for the workload
High swap usage indicates that the system is actively paging memory to disk because the available physical RAM is insufficient to hold the active working set. This causes significant latency because disk I/O is orders of magnitude slower than RAM, leading to intermittent slowdowns for the web application. The fact that multiple virtual hosts are running on CentOS 7 increases the memory demand, making insufficient physical memory the most likely root cause.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Misconfigured virtual host causing memory leaks
Why it's wrong here
Memory leaks could increase memory usage but are not the most likely cause; swap usage indicates overall memory shortage.
✓
Insufficient physical memory for the workload
Why this is correct
Insufficient RAM forces the kernel to use swap, leading to high swap usage and performance degradation.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Network congestion on the internal network
Why it's wrong here
Network congestion would cause slow network responses but not high swap usage.
✗
Excessive CPU load from a runaway process
Why it's wrong here
Excessive CPU load does not directly cause high swap usage; swap is related to memory pressure.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often associate performance issues with CPU or network problems first, overlooking that high swap usage is a direct indicator of memory exhaustion, not a symptom of CPU load or network congestion.
Detailed technical explanation
How to think about this question
Swap usage is tracked via /proc/meminfo (SwapTotal, SwapFree) and can be monitored with commands like free -h or vmstat. When the kernel's memory management subsystem (kswapd) is forced to page out inactive pages to the swap device, it indicates that the system is under memory pressure, often quantified by the 'si' and 'so' columns in vmstat. In a real-world scenario, a CentOS 7 web server running Apache with multiple virtual hosts may have a default MaxClients setting that allows too many concurrent connections, exhausting RAM and triggering swapping.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the XK0-005 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this XK0-005 question in full detail.
Troubleshooting — This question tests Troubleshooting — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Insufficient physical memory for the workload — High swap usage indicates that the system is actively paging memory to disk because the available physical RAM is insufficient to hold the active working set. This causes significant latency because disk I/O is orders of magnitude slower than RAM, leading to intermittent slowdowns for the web application. The fact that multiple virtual hosts are running on CentOS 7 increases the memory demand, making insufficient physical memory the most likely root cause.
What should I do if I get this XK0-005 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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