The answer is to increase the idle timeout setting on the ALB. This is correct because when the ALB’s idle timeout expires before the backend completes processing a request, the load balancer prematurely closes the connection, resulting in a 504 error. By raising the timeout, you allow longer-running requests to finish without being cut off, directly addressing the root cause of ALB 504 errors during peak traffic. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this scenario tests your understanding of how ALB connection management differs from health checks or instance draining—common traps include confusing the idle timeout with the deregistration delay or health check interval. A practical memory tip: think of the idle timeout as a “patience timer” for the ALB; if your backend is slow, you need to give it more time before the ALB gives up and returns a 504.
SAP-C02 Continuous Improvement for Existing Solutions Practice Question
This SAP-C02 practice question tests your understanding of continuous improvement for existing solutions. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 an Application Load Balancer (ALB) to distribute traffic to an Auto Scaling group of EC2 instances. The operations team notices that the ALB is returning a high number of 504 errors during peak hours. Which configuration change is MOST likely to reduce the 504 errors?
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
✓
Increase the idle timeout setting on the ALB.
Option B is correct because increasing the idle timeout setting on the ALB can help prevent premature connection closures that cause 504 errors. Option A is wrong because increasing the deregistration delay only affects instance draining, not idle timeouts. Option C is wrong because enabling cross-zone load balancing does not address timeout issues. Option D is wrong because increasing the health check interval does not affect idle timeouts.
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.
✗
Enable cross-zone load balancing on the ALB.
Why it's wrong here
Cross-zone balancing distributes traffic evenly but does not prevent 504s.
✓
Increase the idle timeout setting on the ALB.
Why this is correct
Higher idle timeout allows longer-lived connections to complete without timing out.
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.
✗
Increase the health check interval for the target group.
Why it's wrong here
Health check interval affects instance health detection, not timeout errors.
✗
Increase the deregistration delay on the target group.
Why it's wrong here
Deregistration delay affects connection draining, not idle timeout.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Got this wrong? Here's your next step.
Identify which SAP-C02 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.
Continuous Improvement for Existing Solutions — This question tests Continuous Improvement for Existing Solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Increase the idle timeout setting on the ALB. — Option B is correct because increasing the idle timeout setting on the ALB can help prevent premature connection closures that cause 504 errors. Option A is wrong because increasing the deregistration delay only affects instance draining, not idle timeouts. Option C is wrong because enabling cross-zone load balancing does not address timeout issues. Option D is wrong because increasing the health check interval does not affect idle timeouts.
What should I do if I get this SAP-C02 question wrong?
Identify which SAP-C02 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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