This CV0-004 practice question tests your understanding of operations and support. 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 uses a cloud-based load balancer to distribute traffic to a fleet of web servers. Users report intermittent timeouts. The administrator reviews the load balancer logs and notices that one backend server has a significantly higher error rate than the others. Which of the following is the BEST course of action?
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
✓
Drain connections to the unhealthy server and troubleshoot its configuration.
Option B is correct because draining connections from the unhealthy server allows the load balancer to stop sending new traffic to it while existing sessions complete, preventing further timeouts. Troubleshooting the server's configuration addresses the root cause of the high error rate, such as misconfigured web server software, resource exhaustion, or application bugs. This approach follows the principle of isolating and resolving the faulty component rather than masking the issue with workarounds.
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.
✗
Immediately add two more backend servers to distribute the load.
Why it's wrong here
Adding servers does not resolve the existing faulty server's issues.
✓
Drain connections to the unhealthy server and troubleshoot its configuration.
Why this is correct
Draining prevents further impact while allowing investigation of the root cause.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Enable sticky sessions on the load balancer to maintain user sessions.
Why it's wrong here
Sticky sessions would route more traffic to the faulty server, worsening timeouts.
✗
Increase the health check interval for all servers to reduce false positives.
Why it's wrong here
Longer intervals could hide real problems and increase timeout risks.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CompTIA often tests the misconception that adding more servers or increasing health check intervals will solve performance issues, but the trap here is that the problem is a specific faulty backend server, not a capacity or health check sensitivity issue, so the correct action is to isolate and troubleshoot that server.
Detailed technical explanation
How to think about this question
Under the hood, cloud load balancers like AWS ALB or Azure Load Balancer use health checks (e.g., HTTP 200 OK or TCP SYN-ACK) to determine backend server status. Draining connections (connection draining in AWS, graceful shutdown in Azure) involves setting a timeout for in-flight requests to complete before the server is removed from the target group, typically using a configurable drain timeout (e.g., 300 seconds). In a real-world scenario, a misconfigured application pool or a memory leak in the web server process could cause intermittent 503 errors, which draining isolates for debugging without impacting all users.
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 network engineer segments a warehouse floor into three subnets: 20 scanners, 5 printers, and 2 management hosts. Picking the wrong mask wastes addresses or leaves too few usable hosts. Exam questions test whether you can apply CIDR notation, calculate block size, and identify the correct usable-host range for a given prefix.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Operations and Support — This question tests Operations and Support — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Drain connections to the unhealthy server and troubleshoot its configuration. — Option B is correct because draining connections from the unhealthy server allows the load balancer to stop sending new traffic to it while existing sessions complete, preventing further timeouts. Troubleshooting the server's configuration addresses the root cause of the high error rate, such as misconfigured web server software, resource exhaustion, or application bugs. This approach follows the principle of isolating and resolving the faulty component rather than masking the issue with workarounds.
What should I do if I get this CV0-004 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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