The answer is that the Auto Scaling group is not configured to perform a rolling update. This is the most likely cause because updating a launch template’s AMI only changes the configuration for future instances; existing instances continue running the old AMI until they are explicitly terminated and replaced. Without a rolling update policy, the Auto Scaling group has no mechanism to cycle through its instances and apply the new launch template, so any new instances launched during a scale-out event will still use the old AMI from the cached instance configuration. On the AWS Certified SysOps Administrator Associate SOA-C02 exam, this scenario tests your understanding that CloudFormation does not automatically trigger instance refreshes—you must define an UpdatePolicy with AutoScalingRollingUpdate. A common trap is assuming that changing the launch template alone will affect running instances, but the key is that the Auto Scaling group must be told to replace them. Memory tip: “Template change, no range—instances stay the same.”
SOA-C02 Deployment, Provisioning, and Automation Practice Question
This SOA-C02 practice question tests your understanding of deployment, provisioning, and automation. 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 DevOps engineer is troubleshooting a failed CloudFormation stack update. The stack includes an Auto Scaling group with a launch template. The update changed the AMI ID in the launch template, but the new instances launched with the old AMI. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The Auto Scaling group is not configured to perform a rolling update.
Option B is correct because updating the launch template does not affect existing instances; a rolling update is required. Option A is wrong because even if the launch template is updated, new instances will still use the old AMI until the Auto Scaling group triggers a replacement. Option C is wrong because the issue is not the AMI ID itself. Option D is wrong because CloudFormation does not automatically perform rolling updates unless specified.
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.
✓
The Auto Scaling group is not configured to perform a rolling update.
Why this is correct
Without a rolling update, the Auto Scaling group continues to use existing instances, which were launched with the old AMI.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The new AMI ID is invalid or not available in the region.
Why it's wrong here
If the AMI ID were invalid, the update would fail.
✗
The CloudFormation stack update did not successfully complete.
Why it's wrong here
The stack update might have completed, but without rolling update, instances are not replaced.
✗
The launch template version is not set to use the latest version.
Why it's wrong here
The launch template version might be set to a specific version, but even with the latest, existing instances won't be replaced.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 SOA-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Deployment, Provisioning, and Automation — This question tests Deployment, Provisioning, and Automation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The Auto Scaling group is not configured to perform a rolling update. — Option B is correct because updating the launch template does not affect existing instances; a rolling update is required. Option A is wrong because even if the launch template is updated, new instances will still use the old AMI until the Auto Scaling group triggers a replacement. Option C is wrong because the issue is not the AMI ID itself. Option D is wrong because CloudFormation does not automatically perform rolling updates unless specified.
What should I do if I get this SOA-C02 question wrong?
Identify which SOA-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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