The answer is to reference the S3 object version in the Lambda function's Code property. This is correct because CloudFormation treats the Lambda function's code as a resource property; by explicitly including the `S3ObjectVersion` parameter, you create a hard dependency on that specific version identifier. When you upload new code to S3, the object version changes, which CloudFormation detects as a property change during a stack update, forcing the Lambda function to be recreated with the updated code. On the DOP-C02 exam, this tests your understanding of CloudFormation's change detection mechanism and how to avoid stale deployments—a common trap is assuming CloudFormation automatically polls S3 for changes, which it does not. Remember the key insight: without the version reference, CloudFormation sees no template change and skips the update entirely. A useful memory tip is "Version is the trigger"—if you want CloudFormation to react to new code, you must explicitly tie the version to the resource property.
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 DevOps engineer is creating a CloudFormation template that includes an AWS Lambda function. The function code is stored in an S3 bucket. The engineer wants to ensure that the Lambda function is updated whenever the code in S3 changes. What should the engineer do?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Reference the S3 object version in the Lambda function's Code property to force an update when the version changes
Option B is correct because referencing the S3 object version in the Lambda function's Code property (e.g., `S3ObjectVersion`) creates a dependency on that specific version. When the S3 object is updated, its version changes, which triggers CloudFormation to detect a change in the template and update the Lambda function during the next stack update. This ensures the function code is refreshed 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.
✗
Use AWS CodeDeploy to deploy the Lambda function
Why it's wrong here
CodeDeploy can deploy Lambda, but it does not automatically detect S3 changes.
✓
Reference the S3 object version in the Lambda function's Code property to force an update when the version changes
Why this is correct
Changing the version triggers a stack update.
Related concept
Read the scenario before looking for a memorised answer.
✗
Add a DependsOn clause to the Lambda function resource
Why it's wrong here
DependsOn does not trigger updates on code changes.
✗
Use AWS CodePipeline to automatically update the stack when the S3 object changes
Why it's wrong here
This is possible but not the simplest solution; the question asks for what the engineer should do.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume any automation tool (CodePipeline or CodeDeploy) can replace the need for explicit version tracking, but CloudFormation requires a property change to trigger an update, and only referencing the S3 object version achieves that directly.
Detailed technical explanation
How to think about this question
Under the hood, CloudFormation compares the template's resource properties during a stack update. By specifying `S3ObjectVersion` in the Lambda `Code` property, any change to the S3 object's version ID (which occurs on every PUT) causes CloudFormation to see a property difference and initiate a Lambda function update. Without this version reference, CloudFormation treats the S3 key as static and may skip the update even if the object content changes, leading to stale code in production.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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.
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: Reference the S3 object version in the Lambda function's Code property to force an update when the version changes — Option B is correct because referencing the S3 object version in the Lambda function's Code property (e.g., `S3ObjectVersion`) creates a dependency on that specific version. When the S3 object is updated, its version changes, which triggers CloudFormation to detect a change in the template and update the Lambda function during the next stack update. This ensures the function code is refreshed 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.
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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