The correct approach is to update the stack set with a new template version that references the updated Lambda code, and let CloudFormation handle the update. This works because CloudFormation StackSets treat custom resources as first-class stack resources; when you submit a revised template pointing to a new Lambda deployment package or S3 URI, the StackSet operation triggers a resource update across all target accounts and regions automatically. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this question tests your understanding of StackSets’ declarative update model versus manual workarounds—a common trap is assuming you must update the Lambda function directly or use aliases, but CloudFormation does not support aliases for custom resource-backed functions. Remember the key principle: always drive changes through the template, not the resource itself. A useful memory tip is “Template first, function follows”—if you change the code, change the template reference, and StackSets propagate the update everywhere without manual intervention.
DOP-C02 Configuration Management and IaC Practice Question
This DOP-C02 practice question tests your understanding of configuration management and iac. 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 large enterprise uses AWS CloudFormation StackSets to deploy resources across multiple accounts and regions. They need to update a stack set that contains a custom resource backed by a Lambda function. The update changes the Lambda function code. What is the CORRECT approach to ensure the Lambda function is updated without manual intervention?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Update the stack set with a new template version that references the updated Lambda code, and let CloudFormation handle the update.
Option A is correct because updating the stack set with new template and parameters triggers CloudFormation to update the Lambda function automatically. Option B is wrong because manually updating the Lambda function is not scalable. Option C is wrong because CloudFormation does not support Lambda function aliases for custom resources. Option D is wrong because StackSets automatically handle updates across accounts.
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 a Lambda function alias and point the custom resource to the alias.
Why it's wrong here
Custom resources do not support aliases.
✗
Create a new stack set for the updated Lambda and delete the old one.
Why it's wrong here
Unnecessary; StackSets support updates.
✓
Update the stack set with a new template version that references the updated Lambda code, and let CloudFormation handle the update.
Why this is correct
CloudFormation will automatically update the Lambda function as part of the stack update.
Related concept
Read the scenario before looking for a memorised answer.
✗
Manually update the Lambda function in each account, then update the stack set.
Why it's wrong here
Not scalable and error prone.
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 DOP-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.
Configuration Management and IaC — This question tests Configuration Management and IaC — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Update the stack set with a new template version that references the updated Lambda code, and let CloudFormation handle the update. — Option A is correct because updating the stack set with new template and parameters triggers CloudFormation to update the Lambda function automatically. Option B is wrong because manually updating the Lambda function is not scalable. Option C is wrong because CloudFormation does not support Lambda function aliases for custom resources. Option D is wrong because StackSets automatically handle updates across accounts.
What should I do if I get this DOP-C02 question wrong?
Identify which DOP-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.
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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