- A
Use AWS Systems Manager to replace the underlying host.
Why wrong: Systems Manager does not automatically replace instances in an ASG.
- B
Manually reboot the instance from the EC2 console.
Why wrong: Manual intervention does not provide automatic recovery and is not scalable.
- C
Create a CloudWatch alarm that triggers an SNS notification to the administrator.
Why wrong: Notification does not automate recovery; the administrator still needs to act.
- D
Configure the Auto Scaling group to use EC2 status checks for health checks and set the health check grace period appropriately.
ASG can automatically terminate and replace unhealthy instances based on EC2 status checks.
Question 256 of 1,546
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 receives an alert that an EC2 instance in an Auto Scaling group is unhealthy. The instance fails the EC2 status check. What is the BEST course of action to restore availability automatically?
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
✓
Configure the Auto Scaling group to use EC2 status checks for health checks and set the health check grace period appropriately.
Option D is correct because configuring the Auto Scaling group to use EC2 status checks for health checks allows it to automatically detect when an instance fails the EC2 status check and replace it with a new one, ensuring high availability without manual intervention. The health check grace period prevents premature termination during initial instance bootstrapping. This is the most automated and resilient approach for restoring availability in response to EC2 status check failures.
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.
- ✗
Use AWS Systems Manager to replace the underlying host.
Why it's wrong here
Systems Manager does not automatically replace instances in an ASG.
- ✗
Manually reboot the instance from the EC2 console.
Why it's wrong here
Manual intervention does not provide automatic recovery and is not scalable.
- ✗
Create a CloudWatch alarm that triggers an SNS notification to the administrator.
Why it's wrong here
Notification does not automate recovery; the administrator still needs to act.
- ✓
Configure the Auto Scaling group to use EC2 status checks for health checks and set the health check grace period appropriately.
Why this is correct
ASG can automatically terminate and replace unhealthy instances based on EC2 status checks.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may think a CloudWatch alarm with SNS notification is sufficient for automatic recovery, but it only provides notification, not automated remediation, whereas the Auto Scaling group's health check configuration directly triggers instance replacement without manual steps.
Detailed technical explanation
How to think about this question
When an Auto Scaling group uses EC2 status checks (which include system status checks and instance status checks), it polls the EC2 health status every few seconds and marks the instance as unhealthy if the check fails. The health check grace period (default 300 seconds) allows time for the instance to initialize and pass its first health check; if set too low, instances may be terminated prematurely during bootstrapping. Under the hood, the Auto Scaling group initiates a scale-in event to terminate the unhealthy instance and launches a new one to maintain the desired capacity, leveraging the EC2 instance lifecycle hooks if configured.
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
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 exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
- →
Reliability and Business Continuity — study guide chapter
Learn the concepts, then practise the questions
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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: Configure the Auto Scaling group to use EC2 status checks for health checks and set the health check grace period appropriately. — Option D is correct because configuring the Auto Scaling group to use EC2 status checks for health checks allows it to automatically detect when an instance fails the EC2 status check and replace it with a new one, ensuring high availability without manual intervention. The health check grace period prevents premature termination during initial instance bootstrapping. This is the most automated and resilient approach for restoring availability in response to EC2 status check failures.
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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