- A
Implement a lifecycle hook in the Auto Scaling group that waits for the instance to signal readiness. Also, configure the target group health check with a longer interval and a higher healthy threshold to ensure the instance is fully operational.
Lifecycle hooks can pause the instance launch until the application signals that it is ready, and the health check can be tuned to match the startup time.
- B
Increase the health check interval to 60 seconds and the healthy threshold to 5.
Why wrong: This delays the time until the instance is considered healthy but does not prevent the ALB from sending traffic if the health check passes earlier.
- C
Use the Auto Scaling group's instance refresh feature with a warm-up time of 60 seconds.
Why wrong: Warm-up time in instance refresh specifies the time before the next batch of instances is terminated, not the time before an instance receives traffic.
- D
Use AWS Global Accelerator to pre-warm the endpoints before directing traffic.
Why wrong: Global Accelerator does not have a pre-warming feature; it routes traffic to healthy endpoints.
SAP-C02 Design for New Solutions Practice Question
This SAP-C02 practice question tests your understanding of design for new 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 runs a critical web application on EC2 instances in an Auto Scaling group across three Availability Zones. The application uses an Application Load Balancer (ALB) with a target group that has health checks configured. Recently, the operations team noticed that during a deployment, the ALB started routing traffic to a new instance before it was ready to serve requests, causing a brief period of errors. The team wants to ensure that new instances are fully initialized and ready before receiving traffic. The application takes about 30 seconds to start up. Current health check settings: health check protocol HTTP, path /, interval 30 seconds, timeout 5 seconds, healthy threshold 2, unhealthy threshold 2. The deployment uses the Auto Scaling group's instance refresh feature. Which of the following is the MOST effective way to prevent traffic from being sent to instances that are not ready?
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
Implement a lifecycle hook in the Auto Scaling group that waits for the instance to signal readiness. Also, configure the target group health check with a longer interval and a higher healthy threshold to ensure the instance is fully operational.
Option A is correct because it uses a lifecycle hook to pause the instance until it signals readiness (e.g., via a custom script that completes initialization), and then configures the target group health check with a longer interval and higher healthy threshold to ensure the instance is fully operational before receiving traffic. This prevents the ALB from routing traffic to an instance that is not yet ready. Option B is wrong because simply increasing the health check interval and threshold does not guarantee the instance has finished its startup process; it may still fail if the application is not ready when the first health check occurs (if the instance takes 30 seconds and interval is 60, the first check is at 60 seconds, but the threshold of 5 means it needs 5 consecutive successes, which delays traffic but doesn't ensure the instance is fully functional from the start). Option C is wrong because the instance refresh warm-up time only delays the start of the refresh process, not the time before an instance receives traffic; it does not integrate with application readiness. Option D is wrong because AWS Global Accelerator does not pre-warm endpoints; it provides static IP addresses and improves performance but does not handle application readiness 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.
- ✓
Implement a lifecycle hook in the Auto Scaling group that waits for the instance to signal readiness. Also, configure the target group health check with a longer interval and a higher healthy threshold to ensure the instance is fully operational.
Why this is correct
Lifecycle hooks can pause the instance launch until the application signals that it is ready, and the health check can be tuned to match the startup time.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Increase the health check interval to 60 seconds and the healthy threshold to 5.
Why it's wrong here
This delays the time until the instance is considered healthy but does not prevent the ALB from sending traffic if the health check passes earlier.
- ✗
Use the Auto Scaling group's instance refresh feature with a warm-up time of 60 seconds.
Why it's wrong here
Warm-up time in instance refresh specifies the time before the next batch of instances is terminated, not the time before an instance receives traffic.
- ✗
Use AWS Global Accelerator to pre-warm the endpoints before directing traffic.
Why it's wrong here
Global Accelerator does not have a pre-warming feature; it routes traffic to healthy endpoints.
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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
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.
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FAQ
Questions learners often ask
What does this SAP-C02 question test?
Design for New Solutions — This question tests Design for New Solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Implement a lifecycle hook in the Auto Scaling group that waits for the instance to signal readiness. Also, configure the target group health check with a longer interval and a higher healthy threshold to ensure the instance is fully operational. — Option A is correct because it uses a lifecycle hook to pause the instance until it signals readiness (e.g., via a custom script that completes initialization), and then configures the target group health check with a longer interval and higher healthy threshold to ensure the instance is fully operational before receiving traffic. This prevents the ALB from routing traffic to an instance that is not yet ready. Option B is wrong because simply increasing the health check interval and threshold does not guarantee the instance has finished its startup process; it may still fail if the application is not ready when the first health check occurs (if the instance takes 30 seconds and interval is 60, the first check is at 60 seconds, but the threshold of 5 means it needs 5 consecutive successes, which delays traffic but doesn't ensure the instance is fully functional from the start). Option C is wrong because the instance refresh warm-up time only delays the start of the refresh process, not the time before an instance receives traffic; it does not integrate with application readiness. Option D is wrong because AWS Global Accelerator does not pre-warm endpoints; it provides static IP addresses and improves performance but does not handle application readiness checks.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 20, 2026
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