- A
Use a Lambda function alias and point the custom resource to the alias.
Why wrong: Custom resources do not support aliases.
- B
Create a new stack set for the updated Lambda and delete the old one.
Why wrong: Unnecessary; StackSets support updates.
- C
Update the stack set with a new template version that references the updated Lambda code, and let CloudFormation handle the update.
CloudFormation will automatically update the Lambda function as part of the stack update.
- D
Manually update the Lambda function in each account, then update the stack set.
Why wrong: Not scalable and error prone.
Question 1,656 of 1,750
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 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
✓
Update the stack set with a new template version that references the updated Lambda code, and let CloudFormation handle the update.
When you update a CloudFormation stack set with a new template version that references updated Lambda code, CloudFormation automatically detects the change to the custom resource and triggers an update to the Lambda function across all target accounts and regions. This approach leverages CloudFormation's built-in drift detection and resource update lifecycle, ensuring the Lambda function code is replaced without any manual intervention. The custom resource's backing Lambda function is updated as part of the stack set update operation because CloudFormation treats the Lambda function as a managed resource within the stack.
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
The trap here is that candidates assume Lambda function aliases or manual updates are necessary for code changes, but CloudFormation's native update mechanism automatically handles code updates when the template references the new code, making aliases irrelevant for this specific use case.
Detailed technical explanation
How to think about this question
Under the hood, CloudFormation uses a change set to compare the current template with the updated template; for custom resources backed by Lambda, CloudFormation invokes the custom resource provider's 'Update' handler (or 'Create' if the physical resource ID changes) when the template changes. The Lambda function code is typically referenced via an Amazon S3 URL or inline code in the template, and CloudFormation will replace the function if the code hash changes, ensuring the update propagates to all stack instances. In real-world scenarios, this approach is critical for compliance because it maintains a single source of truth in the template, avoiding configuration drift across hundreds of accounts.
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.
Quick reference
Cloud Service Model Comparison
| Model | You Manage | Provider Manages | Examples |
|---|---|---|---|
| IaaS | OS, runtime, apps, data | Hardware, hypervisor, networking | EC2, Azure VMs, GCP Compute Engine |
| PaaS | Apps and data | OS, runtime, middleware, hardware | Elastic Beanstalk, Azure App Service |
| SaaS | Data and settings only | Everything else | Microsoft 365, Salesforce, Workday |
| FaaS / Serverless | Function code only | Infra, scaling, runtime | Lambda, Azure Functions, Cloud Run |
| CaaS | Containers and apps | Kubernetes, OS, hardware | EKS, AKS, GKE |
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.
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Configuration Management and IaC — study guide chapter
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FAQ
Questions learners often ask
What does this DOP-C02 question test?
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. — When you update a CloudFormation stack set with a new template version that references updated Lambda code, CloudFormation automatically detects the change to the custom resource and triggers an update to the Lambda function across all target accounts and regions. This approach leverages CloudFormation's built-in drift detection and resource update lifecycle, ensuring the Lambda function code is replaced without any manual intervention. The custom resource's backing Lambda function is updated as part of the stack set update operation because CloudFormation treats the Lambda function as a managed resource within the stack.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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