The correct action is to configure the Auto Scaling group to use EC2 status checks for health checks. This works because an Auto Scaling group can replace failed EC2 instances automatically by setting the health check type to "EC2" instead of the default "ELB"; when either the system or instance status check reports a failure, the Auto Scaling group immediately terminates the unhealthy instance and launches a new one to restore capacity. On the AWS Certified SysOps Administrator Associate SOA-C02 exam, this concept tests your understanding of self-healing architectures and the distinction between EC2 status checks (which monitor the underlying hypervisor and OS) versus ELB health checks (which monitor application-level responses). A common trap is assuming you must use a load balancer to trigger instance replacement, but the Auto Scaling group can act directly on status check failures without an ELB. Memory tip: think "EC2 status checks = hardware and OS heartbeat; ASG listens and replaces on flatline."
SOA-C02 Monitoring, Logging, and Remediation Practice Question
This SOA-C02 practice question tests your understanding of monitoring, logging, and remediation. 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 has deployed a web application on EC2 instances with an Auto Scaling group. The SysOps administrator needs to automatically replace any instance that is in a 'failed' status as reported by the EC2 status checks. Which action should the administrator take?
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.
Option C is correct because an Auto Scaling group can be configured to use EC2 status checks (both system and instance) as the health check type. When the status check reports a failed status, the Auto Scaling group automatically terminates the unhealthy instance and launches a new one to replace it, ensuring self-healing without manual intervention.
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.
✗
Create an AWS Config rule to detect failed status checks and trigger a remediation action.
Why it's wrong here
Config can trigger remediation, but Auto Scaling is simpler and native.
✗
Create an AWS Lambda function that stops and starts the failed instance.
Why it's wrong here
Stopping and starting may not resolve the failure; Auto Scaling is preferred.
✓
Configure the Auto Scaling group to use EC2 status checks for health checks.
Why this is correct
Auto Scaling can automatically replace instances based on health checks.
Related concept
Read the scenario before looking for a memorised answer.
✗
Create a CloudWatch alarm on the StatusCheckFailed metric and trigger an SNS notification.
Why it's wrong here
Notification alone does not replace the instance.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse monitoring (CloudWatch alarms or SNS notifications) with automated remediation, forgetting that Auto Scaling groups have a built-in health check replacement feature that directly addresses the requirement to automatically replace failed instances.
Detailed technical explanation
How to think about this question
When an Auto Scaling group uses EC2 status checks for health checks, it polls the EC2 StatusCheckFailed metric (which aggregates both system and instance status checks) every few minutes. If the metric indicates a failure, the Auto Scaling group marks the instance as unhealthy, detaches it, terminates it, and launches a new instance to maintain the desired capacity. This mechanism leverages the same status checks that appear in the EC2 console and CloudWatch, ensuring consistent health evaluation across AWS services.
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.
Monitoring, Logging, and Remediation — This question tests Monitoring, Logging, and Remediation — 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. — Option C is correct because an Auto Scaling group can be configured to use EC2 status checks (both system and instance) as the health check type. When the status check reports a failed status, the Auto Scaling group automatically terminates the unhealthy instance and launches a new one to replace it, ensuring self-healing without manual intervention.
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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Question Discussion
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