The answer is to terminate the unresponsive EC2 instance and let the Auto Scaling group automatically launch a replacement. This is correct because Auto Scaling groups are designed to maintain a desired capacity; when an instance is terminated, the group’s health checks detect the missing instance and immediately spin up a new one using the launch template or configuration, restoring service with minimal data loss and no manual intervention. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this scenario tests your understanding of Auto Scaling lifecycle hooks, health check grace periods, and the principle that terminating a faulty instance is often faster than attempting in-place recovery. A common trap is trying to reboot or SSH into the unresponsive instance, which wastes time and risks further data corruption. Remember the memory tip: “Terminate to regenerate” — when an instance is unresponsive in an Auto Scaling group, killing it is the quickest path to a healthy replacement.
DOP-C02 Incident and Event Response Practice Question
This DOP-C02 practice question tests your understanding of incident and event response. 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 DevOps engineer notices that an EC2 instance running a critical application is unresponsive. The instance is part of an Auto Scaling group with a minimum size of 2. What is the quickest way to restore service with minimal data loss?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Terminate the instance and let the Auto Scaling group launch a new one.
Option C is correct because terminating the unresponsive instance triggers the Auto Scaling group to automatically launch a replacement instance, restoring service with minimal data loss. Since the Auto Scaling group has a minimum size of 2, it will immediately detect the terminated instance and launch a new one using the launch template or configuration, ensuring the desired capacity is maintained 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.
✗
Stop and start the instance from the EC2 console.
Why it's wrong here
Stopping an unresponsive instance may not work; termination is more reliable.
✗
Create a new AMI from the instance and launch a replacement manually.
Why it's wrong here
This takes time and manual effort; Auto Scaling can handle it automatically.
✓
Terminate the instance and let the Auto Scaling group launch a new one.
Why this is correct
Auto Scaling will automatically replace the instance.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Restore the instance from the most recent EBS snapshot.
Why it's wrong here
This is time-consuming and may not address the root cause of unresponsiveness.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may think stopping and starting the instance (Option A) is the quickest fix, but they overlook that the Auto Scaling group's automated self-healing is designed exactly for this scenario and is faster than any manual recovery method.
Detailed technical explanation
How to think about this question
Auto Scaling groups use health checks (EC2 status checks or ELB health checks) to detect unhealthy instances; when an instance is terminated, the group's desired capacity is decremented, and the Auto Scaling group immediately launches a new instance to meet the minimum size. The new instance is provisioned from the launch template, which typically includes the latest AMI and user data, ensuring consistency. In a real-world scenario, if the instance is part of a stateful application, you might need to attach the original EBS volume to the new instance to preserve data, but the question emphasizes 'quickest' and 'minimal data loss,' so termination and automatic replacement is the fastest recovery path.
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.
Incident and Event Response — This question tests Incident and Event Response — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Terminate the instance and let the Auto Scaling group launch a new one. — Option C is correct because terminating the unresponsive instance triggers the Auto Scaling group to automatically launch a replacement instance, restoring service with minimal data loss. Since the Auto Scaling group has a minimum size of 2, it will immediately detect the terminated instance and launch a new one using the launch template or configuration, ensuring the desired capacity is maintained without manual intervention.
What should I do if I get this DOP-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
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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