This CV0-004 practice question tests your understanding of troubleshooting. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 recently migrated an application to the cloud. The application uses a load balancer in front of multiple EC2 instances. After the migration, users report that they occasionally receive 'Connection refused' errors. The administrator checks the load balancer health check logs and finds that some instances are marked unhealthy intermittently. The application's health check endpoint returns HTTP 200 when tested manually from the admin's workstation. What is the most likely cause?
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
✓
Security group rules blocking the load balancer health checks
Option A is correct because if the security group does not allow traffic from the load balancer's health check source, the health checks will fail intermittently. Option B is wrong because a short interval would not cause intermittent failures; it would cause constant failures. Option C is wrong because the application binding to an incorrect IP would cause constant failures, not intermittent. Option D is wrong because memory exhaustion would cause overall application failure, not just health checks.
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.
✗
The health check interval is too short
Why it's wrong here
A short interval would cause more frequent health checks, not intermittent failures.
✓
Security group rules blocking the load balancer health checks
Why this is correct
If the security group blocks health check traffic, the load balancer may intermittently mark instances unhealthy.
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.
✗
The instances are running out of memory
Why it's wrong here
Memory exhaustion would affect the entire application, not just health checks.
✗
The application is not binding to the correct IP address
Why it's wrong here
Incorrect binding would cause persistent health check failures.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 CV0-004 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.
What to study next
Got this wrong? Here's your next step.
Identify which CV0-004 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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: Security group rules blocking the load balancer health checks — Option A is correct because if the security group does not allow traffic from the load balancer's health check source, the health checks will fail intermittently. Option B is wrong because a short interval would not cause intermittent failures; it would cause constant failures. Option C is wrong because the application binding to an incorrect IP would cause constant failures, not intermittent. Option D is wrong because memory exhaustion would cause overall application failure, not just health checks.
What should I do if I get this CV0-004 question wrong?
Identify which CV0-004 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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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