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Reliability and Business Continuity →mediumMultiple ChoiceObjective-mapped

SOA-C02 Reliability and Business Continuity Practice Question

This SOA-C02 practice question tests your understanding of reliability and business continuity. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 ELB.

The correct action is to change the HealthCheckType to ELB. With HealthCheckType=EC2, the Auto Scaling group only checks EC2 status (e.g., instance reachable), which passes quickly after launch. However, the ALB independently performs its own health check against the application endpoint. Since the application takes up to 2 minutes to start, the ALB health check fails, causing the ALB to deregister the instance and the Auto Scaling group to terminate it (with EC2 health check type, the ALB health check result is not used for termination decisions). By setting HealthCheckType=ELB, the Auto Scaling group will use the ALB's health check status, and the HealthCheckGracePeriod (300 seconds) will apply to the ALB health checks, delaying them until after the application starts. This prevents premature termination. Option C (changing to ELB) achieves this; increasing the grace period (Option B) does not help because the ALB health check is independent when HealthCheckType=EC2, and decreasing it (Option D) would make the problem worse.

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.

  • ✗

    Change the HealthCheckType to EC2 (already EC2, but change to ELB).

    Why it's wrong here

    This option is misleading. It suggests changing to EC2 (which is already the current setting) and then implies changing to ELB, but the correct single action is to change directly to ELB (Option C). Simply keeping EC2 does not solve the problem because the ALB health check is not considered for termination decisions.

  • ✗

    Increase the HealthCheckGracePeriod to 600 seconds.

    Why it's wrong here

    Increasing the HealthCheckGracePeriod does not help because with HealthCheckType=EC2, the grace period only applies to EC2 health checks, not the ALB health check that is causing the premature termination.

  • ✓

    Change the HealthCheckType to ELB.

    Why this is correct

    Correct. Changing HealthCheckType to ELB makes the Auto Scaling group use the ALB's health check result. The HealthCheckGracePeriod then applies to the ALB health checks, allowing the application time to start before health checks begin.

    Related concept

    Read the scenario before looking for a memorised answer.

  • ✗

    Decrease the HealthCheckGracePeriod to 120 seconds.

    Why it's wrong here

    Decreasing the HealthCheckGracePeriod to 120 seconds would shorten the grace period, potentially making the problem worse as instances would be checked sooner.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates assume increasing the HealthCheckGracePeriod will solve the problem, not realizing that the grace period only applies to EC2 health checks, not ALB health checks, and that the ALB's independent health check is what causes the premature termination.

Detailed technical explanation

How to think about this question

When HealthCheckType is set to EC2, the Auto Scaling group relies on the EC2 instance status checks (system and instance reachability), which pass within seconds of launch. In contrast, the ALB target group health check is a separate mechanism that probes the application endpoint (e.g., HTTP GET /health) and can be configured with a longer interval (e.g., 30 seconds) and unhealthy threshold (e.g., 3 failures). By switching to ELB health checks, the Auto Scaling group waits for the ALB to report the instance as healthy, which respects the application's startup time. This is critical for applications with slow initialization, such as those requiring database connections or cache warming.

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 SOA-C02 question test?

Reliability and Business Continuity — This question tests Reliability and Business Continuity — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: Change the HealthCheckType to ELB. — The correct action is to change the HealthCheckType to ELB. With HealthCheckType=EC2, the Auto Scaling group only checks EC2 status (e.g., instance reachable), which passes quickly after launch. However, the ALB independently performs its own health check against the application endpoint. Since the application takes up to 2 minutes to start, the ALB health check fails, causing the ALB to deregister the instance and the Auto Scaling group to terminate it (with EC2 health check type, the ALB health check result is not used for termination decisions). By setting HealthCheckType=ELB, the Auto Scaling group will use the ALB's health check status, and the HealthCheckGracePeriod (300 seconds) will apply to the ALB health checks, delaying them until after the application starts. This prevents premature termination. Option C (changing to ELB) achieves this; increasing the grace period (Option B) does not help because the ALB health check is independent when HealthCheckType=EC2, and decreasing it (Option D) would make the problem worse.

What should I do if I get this SOA-C02 question wrong?

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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Last reviewed: Jul 4, 2026

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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.