- A
Reduce the ALB health check timeout to 1 second so failures are detected faster.
Why wrong: Shortening the timeout can increase false negatives during startup and make instances appear unhealthy even sooner, which can increase churn.
- B
Increase the Auto Scaling group health check grace period to cover application startup and initialization time.
The ASG health check grace period tells Auto Scaling to ignore failing health checks for a period after instance launch. This prevents newly launched instances from being replaced before the application has finished booting and can pass ALB health checks.
- C
Enable connection draining on the ALB target group but set deregistration delay to 0 seconds.
Why wrong: Connection draining helps in-flight requests complete during deregistration, but it does not stop the ASG from replacing instances that are failing health checks during startup.
- D
Switch the ALB target group health checks from HTTP to TCP so the application does not need to return HTTP 200.
Why wrong: TCP health checks only confirm that the port is open. They can mark an instance healthy even if the application is not actually ready to serve requests.
SAA-C03 Design Resilient Architectures Practice Question
This SAA-C03 practice question tests your understanding of design resilient architectures. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. A key principle to apply: aSG health check grace period applies to newly launched instances.. 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 web application runs on an Auto Scaling group (ASG) behind an Application Load Balancer (ALB). After a new release, instances begin failing ALB health checks with errors like 502 while the application is still starting up. CloudWatch shows that the ASG replaces the instances before they finish initializing, so traffic never reaches healthy targets. Which change most directly prevents premature replacement during startup so traffic can resume as soon as the instances are actually healthy?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"never"Why it matters: Absolute qualifier. True only if the statement has zero exceptions — be cautious of options that seem obvious but break down in edge cases.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Increase the Auto Scaling group health check grace period to cover application startup and initialization time.
B is correct because the Auto Scaling group health check grace period allows instances a specified amount of time to initialize before the ASG starts checking their health status. By increasing this grace period to cover the application startup time, the ASG will not prematurely replace instances that are still initializing, allowing them to pass the ALB health checks and begin receiving traffic once they are actually healthy.
Key principle: ASG health check grace period applies to newly launched instances.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Reduce the ALB health check timeout to 1 second so failures are detected faster.
Why it's wrong here
Shortening the timeout can increase false negatives during startup and make instances appear unhealthy even sooner, which can increase churn.
- ✓
Increase the Auto Scaling group health check grace period to cover application startup and initialization time.
Why this is correct
The ASG health check grace period tells Auto Scaling to ignore failing health checks for a period after instance launch. This prevents newly launched instances from being replaced before the application has finished booting and can pass ALB health checks.
Clue confirmation
The clue word "never" in the question point toward this answer.
Related concept
ASG health check grace period applies to newly launched instances.
- ✗
Enable connection draining on the ALB target group but set deregistration delay to 0 seconds.
Why it's wrong here
Connection draining helps in-flight requests complete during deregistration, but it does not stop the ASG from replacing instances that are failing health checks during startup.
- ✗
Switch the ALB target group health checks from HTTP to TCP so the application does not need to return HTTP 200.
Why it's wrong here
TCP health checks only confirm that the port is open. They can mark an instance healthy even if the application is not actually ready to serve requests.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the ALB health check timeout or interval with the ASG health check grace period, thinking that adjusting ALB settings will fix the premature replacement issue, when in fact the ASG grace period is the direct control for delaying health check evaluation during startup.
Detailed technical explanation
How to think about this question
The Auto Scaling group health check grace period (default 300 seconds) is a timer that starts when an instance enters the InService state; during this period, the ASG does not act on health check failures from the ELB or EC2 status checks. Under the hood, the ASG monitors the 'HealthStatus' metric from CloudWatch, and only after the grace period expires does it evaluate whether to terminate and replace an instance based on health check results. In real-world scenarios, applications with long initialization times (e.g., loading large models, warming caches, or running database migrations) often require a grace period of 600 seconds or more to avoid unnecessary replacements.
KKey Concepts to Remember
- ASG health check grace period applies to newly launched instances.
- It prevents premature termination of instances during application startup.
- The grace period duration should cover the full application initialization time.
- ASG health checks can use EC2 status checks or ELB health checks.
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
ASG health check grace period applies to newly launched instances.
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. ASG health check grace period applies to newly launched instances. 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.
Review aSG health check grace period applies to newly launched instances., then practise related SAA-C03 questions on the same topic to reinforce the concept.
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FAQ
Questions learners often ask
What does this SAA-C03 question test?
Design Resilient Architectures — This question tests Design Resilient Architectures — ASG health check grace period applies to newly launched instances..
What is the correct answer to this question?
The correct answer is: Increase the Auto Scaling group health check grace period to cover application startup and initialization time. — B is correct because the Auto Scaling group health check grace period allows instances a specified amount of time to initialize before the ASG starts checking their health status. By increasing this grace period to cover the application startup time, the ASG will not prematurely replace instances that are still initializing, allowing them to pass the ALB health checks and begin receiving traffic once they are actually healthy.
What should I do if I get this SAA-C03 question wrong?
Review aSG health check grace period applies to newly launched instances., then practise related SAA-C03 questions on the same topic to reinforce the concept.
Are there clue words in this question I should notice?
Yes — watch for: "never". Absolute qualifier. True only if the statement has zero exceptions — be cautious of options that seem obvious but break down in edge cases.
What is the key concept behind this question?
ASG health check grace period applies to newly launched instances.
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Last reviewed: Jun 11, 2026
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