- A
Set a health check grace period on the Auto Scaling group that exceeds the application startup/warm-up time.
A health check grace period delays when the Auto Scaling group starts evaluating instance health. This prevents the ASG from terminating instances due to ALB/target health being unhealthy during the initial warm-up window, breaking the unhealthy/termination loop.
- B
Increase the Auto Scaling group's desired capacity to a higher number than required.
Why wrong: Higher desired capacity may reduce the symptoms by keeping more instances running, but it does not stop the ASG from terminating individual instances that fail health checks before the app is ready.
- C
Disable ALB target group health checks so instances are considered healthy as soon as they register.
Why wrong: Disabling health checks can route traffic to targets that are still warming up. That can increase 5xx errors and does not address ASG termination based on unhealthy health evaluations.
- D
Change the Auto Scaling health check type from ELB to EC2 so the ALB will no longer determine instance health.
Why wrong: Even if EC2 status checks pass, the application may still not be ready. The instance can remain in service while still causing failed requests, and the ASG will not use ALB readiness to enforce correct routing behavior.
SAA-C03 Design Resilient Architectures Practice Question
This SAA-C03 practice question tests your understanding of design resilient architectures. 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.
An Auto Scaling group behind an Application Load Balancer frequently replaces new EC2 instances. The application needs ~6 minutes to warm up after instance launch. However, the ALB target group health checks start immediately and mark the targets unhealthy until the application is ready. Because the targets become unhealthy early, the Auto Scaling group then terminates the instances and launches replacements, creating a repeated unhealthy/termination loop.
What configuration change will most directly improve recovery by preventing premature ASG termination while the application is warming up?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"immediately / without restart"Why it matters: Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.
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
Set a health check grace period on the Auto Scaling group that exceeds the application startup/warm-up time.
The health check grace period on an Auto Scaling group (ASG) allows a newly launched EC2 instance to bypass health check failures for a specified duration. By setting this grace period to exceed the application's ~6-minute warm-up time, the ASG will not prematurely terminate the instance based on ALB health check results. This directly breaks the unhealthy/termination loop while the application initializes.
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.
- ✓
Set a health check grace period on the Auto Scaling group that exceeds the application startup/warm-up time.
Why this is correct
A health check grace period delays when the Auto Scaling group starts evaluating instance health. This prevents the ASG from terminating instances due to ALB/target health being unhealthy during the initial warm-up window, breaking the unhealthy/termination loop.
Clue confirmation
The clue word "immediately / without restart" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Increase the Auto Scaling group's desired capacity to a higher number than required.
Why it's wrong here
Higher desired capacity may reduce the symptoms by keeping more instances running, but it does not stop the ASG from terminating individual instances that fail health checks before the app is ready.
- ✗
Disable ALB target group health checks so instances are considered healthy as soon as they register.
Why it's wrong here
Disabling health checks can route traffic to targets that are still warming up. That can increase 5xx errors and does not address ASG termination based on unhealthy health evaluations.
- ✗
Change the Auto Scaling health check type from ELB to EC2 so the ALB will no longer determine instance health.
Why it's wrong here
Even if EC2 status checks pass, the application may still not be ready. The instance can remain in service while still causing failed requests, and the ASG will not use ALB readiness to enforce correct routing behavior.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may think disabling health checks or changing the health check type is a valid fix, but the correct solution is to use the ASG's built-in grace period to decouple early health check failures from termination decisions.
Detailed technical explanation
How to think about this question
The health check grace period is defined in the ASG's `HealthCheckGracePeriod` parameter (in seconds). During this window, the ASG ignores health check failures from the ELB or EC2 status checks. Under the hood, the ASG uses the `DescribeInstanceHealth` API to poll the ALB target group; without a grace period, a single unhealthy check triggers termination. In production, this grace period should be set to the 95th percentile of application startup time to avoid flapping, and combined with a slow-start mode on the ALB target group to gradually ramp traffic.
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 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 exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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 — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Set a health check grace period on the Auto Scaling group that exceeds the application startup/warm-up time. — The health check grace period on an Auto Scaling group (ASG) allows a newly launched EC2 instance to bypass health check failures for a specified duration. By setting this grace period to exceed the application's ~6-minute warm-up time, the ASG will not prematurely terminate the instance based on ALB health check results. This directly breaks the unhealthy/termination loop while the application initializes.
What should I do if I get this SAA-C03 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: "immediately / without restart". Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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