- A
Use the AWS CloudFormation console to directly update the stack with the new instance type and monitor the events.
Why wrong: Directly updating the stack will apply changes immediately without a preview. The administrator cannot review potential replacements beforehand.
- B
Create a change set from the updated template, review the changes, and then execute the change set.
A change set provides a detailed summary of changes (add, modify, replace) before execution. This allows the administrator to see if the instance will be replaced or updated in place.
- C
Use the AWS CloudFormation drift detection feature to check for differences between the stack and the template.
Why wrong: Drift detection compares the current stack resources with the expected template state, not the other way around. It does not preview proposed changes.
- D
Modify the CloudFormation template locally and use the AWS CLI to validate it with 'aws cloudformation validate-template'.
Why wrong: The validate-template command only checks syntax and parameter validity. It does not show how the changes would affect existing resources.
Quick Answer
The answer is to create a change set from the updated template, review the changes, and then execute the change set. This is correct because a CloudFormation change set provides a detailed preview of the proposed modifications before they are applied, allowing you to see exactly which resources will be added, modified, or replaced—critical when changing an EC2 instance type from t2.micro to t3.micro, as you can confirm no unexpected resource replacement (like a new instance being created) will occur. On the AWS Certified SysOps Administrator Associate SOA-C02 exam, this question tests your understanding of safe stack update workflows, and a common trap is to confuse change sets with direct stack updates or drift detection, which only shows current differences, not proposed changes. Remember the memory tip: “Change sets let you check before you wreck.”
SOA-C02 Deployment, Provisioning, and Automation Practice Question
This SOA-C02 practice question tests your understanding of deployment, provisioning, and automation. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 maintains an AWS CloudFormation stack that deploys an Amazon EC2 instance. The administrator needs to change the instance type from t2.micro to t3.micro. The administrator wants to review the proposed changes before applying them to ensure no unexpected resource replacement occurs. Which CloudFormation feature should the administrator use?
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
Create a change set from the updated template, review the changes, and then execute the change set.
Option B is correct because a change set allows the administrator to review the proposed modifications (including whether any resource replacement will occur) before applying them. By creating a change set from the updated template, the administrator can inspect the list of changes, such as the instance type update, and confirm that no unexpected resource replacement (e.g., a new EC2 instance being created) will happen. Only after reviewing the change set can the administrator safely execute it to apply the changes.
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 the AWS CloudFormation console to directly update the stack with the new instance type and monitor the events.
Why it's wrong here
Directly updating the stack will apply changes immediately without a preview. The administrator cannot review potential replacements beforehand.
- ✓
Create a change set from the updated template, review the changes, and then execute the change set.
Why this is correct
A change set provides a detailed summary of changes (add, modify, replace) before execution. This allows the administrator to see if the instance will be replaced or updated in place.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use the AWS CloudFormation drift detection feature to check for differences between the stack and the template.
Why it's wrong here
Drift detection compares the current stack resources with the expected template state, not the other way around. It does not preview proposed changes.
- ✗
Modify the CloudFormation template locally and use the AWS CLI to validate it with 'aws cloudformation validate-template'.
Why it's wrong here
The validate-template command only checks syntax and parameter validity. It does not show how the changes would affect existing resources.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse change sets with drift detection or template validation, not realizing that change sets are specifically designed to preview the impact of stack updates before execution.
Trap categories for this question
Command / output trap
The validate-template command only checks syntax and parameter validity. It does not show how the changes would affect existing resources.
Detailed technical explanation
How to think about this question
Change sets work by generating a list of resource modifications (e.g., 'Modify', 'Replace', 'Add', 'Remove') based on the difference between the current stack template and the updated template, using AWS CloudFormation's internal resource policy and replacement logic. For EC2 instance types, changing from t2.micro to t3.micro typically triggers a 'Modify' action (no replacement) because the instance type is a modifiable attribute, but if the change requires a new instance (e.g., due to incompatible architecture), the change set will show a 'Replace' action. This feature is critical in production environments where unintended resource replacement could cause downtime or data loss.
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
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FAQ
Questions learners often ask
What does this SOA-C02 question test?
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: Create a change set from the updated template, review the changes, and then execute the change set. — Option B is correct because a change set allows the administrator to review the proposed modifications (including whether any resource replacement will occur) before applying them. By creating a change set from the updated template, the administrator can inspect the list of changes, such as the instance type update, and confirm that no unexpected resource replacement (e.g., a new EC2 instance being created) will happen. Only after reviewing the change set can the administrator safely execute it to apply the changes.
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: Jun 11, 2026
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