- A
Change the HealthCheckType to EC2 (already EC2, but change to ELB).
ELB health checks can be configured to check the application endpoint after it is ready.
- B
Increase the HealthCheckGracePeriod to 600 seconds.
Why wrong: The grace period is not the issue; the health check type is.
- C
Change the HealthCheckType to ELB.
Why wrong: This is the correct action, but the option text says 'already EC2, but change to ELB' -- wait, the correct answer is to change to ELB. However, the option B says 'Change HealthCheckType to EC2' which is wrong. Let me correct: Actually, the correct answer is to change to ELB. Option B in this question is 'Change the HealthCheckType to EC2' which is incorrect. Option C is 'Change the HealthCheckType to ELB' which is correct. So the correct option is C. Let me adjust the JSON accordingly.
- D
Decrease the HealthCheckGracePeriod to 120 seconds.
Why wrong: Decreasing would likely cause more false positives.
Quick Answer
The correct change is to switch the HealthCheckType from EC2 to ELB. While the HealthCheckGracePeriod of 300 seconds is more than enough for the application’s two-minute startup, the EC2 health check type relies solely on the instance’s underlying system status checks, which can fail if the OS or hypervisor hasn’t fully initialized—regardless of whether the application is ready. By changing to the ELB health check type, the Auto Scaling group uses the Application Load Balancer’s own health probes, which can be configured to wait for a successful HTTP response from the application, aligning the health check with actual service readiness. On the SOA-C02 exam, this scenario tests your understanding that HealthCheckType=EC2 ignores the ALB’s deeper application-level checks, a common trap where candidates mistakenly increase the grace period instead of fixing the check type. Remember the memory tip: “EC2 checks the box, ELB checks the app”—if your application needs time to respond, always use ELB health checks.
SOA-C02 Reliability and Business Continuity Practice Question
This SOA-C02 practice question tests your understanding of reliability and business continuity. 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 SysOps administrator is tuning the health check of an Auto Scaling group. The group uses an ALB. The application takes up to 2 minutes to start. The health check settings are: HealthCheckGracePeriod=300, HealthCheckType=EC2. The administrator notices that instances are often marked unhealthy and terminated shortly after launch. What should the administrator change?
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
Change the HealthCheckType to EC2 (already EC2, but change to ELB).
Option C is correct: The HealthCheckGracePeriod is 300 seconds (5 minutes), which is sufficient for the 2-minute startup. However, HealthCheckType=EC2 means the ASG uses EC2 status checks, not ALB health checks. The EC2 status checks may fail if the instance is not fully initialized. Changing to ELB health checks allows the ASG to use the ALB health check, which can be configured to wait for the application to respond. Option A is incorrect because the grace period is already long enough. Option B is incorrect because increasing the grace period doesn't fix the health check type mismatch. Option D is incorrect because decreasing the grace period would make the problem worse.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Change the HealthCheckType to EC2 (already EC2, but change to ELB).
Why this is correct
ELB health checks can be configured to check the application endpoint after it is ready.
Related concept
Static NAT maps one inside address to one outside address.
- ✗
Increase the HealthCheckGracePeriod to 600 seconds.
Why it's wrong here
The grace period is not the issue; the health check type is.
- ✗
Change the HealthCheckType to ELB.
Why it's wrong here
This is the correct action, but the option text says 'already EC2, but change to ELB' -- wait, the correct answer is to change to ELB. However, the option B says 'Change HealthCheckType to EC2' which is wrong. Let me correct: Actually, the correct answer is to change to ELB. Option B in this question is 'Change the HealthCheckType to EC2' which is incorrect. Option C is 'Change the HealthCheckType to ELB' which is correct. So the correct option is C. Let me adjust the JSON accordingly.
- ✗
Decrease the HealthCheckGracePeriod to 120 seconds.
Why it's wrong here
Decreasing would likely cause more false positives.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
- Static NAT maps one inside address to one outside address.
- PAT allows many inside hosts to share one public address using ports.
- Inside local and inside global describe the private and translated addresses.
- NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
- Identify inside and outside interfaces first.
- Check whether the scenario needs static NAT, dynamic NAT or PAT.
- Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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. NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated. 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 the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related SOA-C02 NAT questions on configuration and troubleshooting.
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Reliability and Business Continuity — study guide chapter
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FAQ
Questions learners often ask
What does this SOA-C02 question test?
Reliability and Business Continuity — This question tests Reliability and Business Continuity — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Change the HealthCheckType to EC2 (already EC2, but change to ELB). — Option C is correct: The HealthCheckGracePeriod is 300 seconds (5 minutes), which is sufficient for the 2-minute startup. However, HealthCheckType=EC2 means the ASG uses EC2 status checks, not ALB health checks. The EC2 status checks may fail if the instance is not fully initialized. Changing to ELB health checks allows the ASG to use the ALB health check, which can be configured to wait for the application to respond. Option A is incorrect because the grace period is already long enough. Option B is incorrect because increasing the grace period doesn't fix the health check type mismatch. Option D is incorrect because decreasing the grace period would make the problem worse.
What should I do if I get this SOA-C02 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related SOA-C02 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
About these practice questions
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Last reviewed: Jun 20, 2026
This SOA-C02 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the SOA-C02 exam.
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