The answer is to increase the number of worker processes or threads in the web server configuration. This resolves the connection refused errors because the CPU is the bottleneck, not memory—the server has 12GB free RAM and zero swap usage, yet the load average of 3.5 to 4.2 is nearly maxing out the four CPU cores, while the web server process itself is consuming 200% CPU. When the server hits its configured limit of 500 concurrent connections during peak times, it cannot accept new requests, leading to timeouts and refusals; adding more workers lets the server handle more simultaneous connections by better distributing the workload across available cores. On the CompTIA Linux+ XK0-005 exam, this scenario tests your ability to distinguish between CPU and memory bottlenecks using tools like top and dmesg—a common trap is to assume more RAM is needed when the real issue is thread exhaustion. Remember the mnemonic: “High load, low mem free? Add workers, not memory.”
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 company runs a critical web application on a Linux server. The server has 16GB RAM and 4 CPU cores. Recently, users have reported intermittent timeouts and slow response times. The administrator logs in and runs 'top', which shows the web server process using 200% CPU (multi-threaded) and 2GB RAM. Free memory is 12GB, and swap usage is 0. The load average is 3.5, 4.0, 4.2. The administrator checks 'dmesg' and sees no OOM or hardware errors. The web server logs show many 'connection refused' errors during peak times. The application is configured to handle up to 500 concurrent connections. The administrator suspects the issue is related to the number of worker processes or threads. Which of the following is the BEST course of action to resolve the issue?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Increase the number of worker processes or threads in the web server configuration.
The web server is using 200% CPU (multi-threaded) and has 12GB free RAM with no swap usage, indicating CPU is the bottleneck, not memory. The load average (3.5–4.2) exceeds the 4 CPU cores, meaning the system is overloaded with processes/threads. The 'connection refused' errors during peak times suggest the server is hitting its connection limit (500 concurrent connections) and rejecting new ones. Increasing worker processes/threads allows the server to handle more concurrent connections, utilizing the available CPU cores more efficiently to reduce timeouts and refusals.
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.
✓
Increase the number of worker processes or threads in the web server configuration.
Why this is correct
This directly addresses the connection refused errors by allowing more concurrent connections.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Add more CPU cores by migrating to a larger instance.
Why it's wrong here
CPU usage is high but load average is within core count; the issue is connection limits.
✗
Decrease the number of worker processes to reduce CPU load.
Why it's wrong here
Reducing workers would increase refusals, not solve the problem.
✗
Add more RAM to the server.
Why it's wrong here
Memory is not a bottleneck; 12GB free indicates sufficient RAM.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CompTIA often tests the misconception that high CPU usage always means the server needs fewer workers or more hardware, but the real issue here is that the server is rejecting connections because it has too few workers to handle the configured 500 concurrent connections, not because the CPU is overloaded by existing workers.
Detailed technical explanation
How to think about this question
Under the hood, web servers like Apache use a prefork or worker MPM where each process/thread handles one connection; the '200% CPU' indicates two threads are fully saturated on two cores. The load average of 3.5–4.2 means the run queue has more tasks than available cores, causing scheduling delays and timeouts. Increasing worker processes (e.g., Apache's 'MaxRequestWorkers' or Nginx's 'worker_connections') allows the server to queue and process more simultaneous requests, reducing the 'connection refused' errors that occur when the listen backlog or max clients is exhausted.
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: Increase the number of worker processes or threads in the web server configuration. — The web server is using 200% CPU (multi-threaded) and has 12GB free RAM with no swap usage, indicating CPU is the bottleneck, not memory. The load average (3.5–4.2) exceeds the 4 CPU cores, meaning the system is overloaded with processes/threads. The 'connection refused' errors during peak times suggest the server is hitting its connection limit (500 concurrent connections) and rejecting new ones. Increasing worker processes/threads allows the server to handle more concurrent connections, utilizing the available CPU cores more efficiently to reduce timeouts and refusals.
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: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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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