- A
Set Type: Canary in the DeploymentPreference of the Lambda function and add CanarySetting: { Percent: 10 } under DeploymentPreference.
This is the correct syntax for a canary deployment in SAM.
- B
Set CanarySetting: { Percent: 10 } in the API Gateway resource's properties.
Why wrong: CanarySetting is not a property of the API Gateway resource; it is part of the Lambda function's DeploymentPreference.
- C
Set Type: Canary and TrafficShiftType: Canary in the DeploymentPreference of the Lambda function.
Why wrong: TrafficShiftType is not a valid property in SAM; Type: Canary already indicates a canary deployment.
- D
Set Type: Canary in the DeploymentPreference of the Lambda function and add a Percentage: 10 property.
Why wrong: Percentage is not a direct property of DeploymentPreference; it is part of CanarySetting.
DVA-C02 Deployment Practice Question
This DVA-C02 practice question tests your understanding of deployment. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 company deploys a serverless application using AWS SAM. The application includes an API Gateway REST API and multiple Lambda functions. The developer wants to deploy a new version of the API with a canary release strategy, sending 10% of traffic to the new version initially. Which SAM template configuration should the developer 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
Set Type: Canary in the DeploymentPreference of the Lambda function and add CanarySetting: { Percent: 10 } under DeploymentPreference.
Option A is correct because AWS SAM's `DeploymentPreference` with `Type: Canary` on the Lambda function enables canary traffic shifting for the API Gateway integration. The `CanarySetting` property with `Percent: 10` specifies that 10% of traffic is initially routed to the new Lambda version, while the remaining 90% goes to the previous version. This configuration leverages SAM's built-in CodeDeploy integration to manage the canary release automatically.
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.
- ✓
Set Type: Canary in the DeploymentPreference of the Lambda function and add CanarySetting: { Percent: 10 } under DeploymentPreference.
Why this is correct
This is the correct syntax for a canary deployment in SAM.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Set CanarySetting: { Percent: 10 } in the API Gateway resource's properties.
Why it's wrong here
CanarySetting is not a property of the API Gateway resource; it is part of the Lambda function's DeploymentPreference.
- ✗
Set Type: Canary and TrafficShiftType: Canary in the DeploymentPreference of the Lambda function.
Why it's wrong here
TrafficShiftType is not a valid property in SAM; Type: Canary already indicates a canary deployment.
- ✗
Set Type: Canary in the DeploymentPreference of the Lambda function and add a Percentage: 10 property.
Why it's wrong here
Percentage is not a direct property of DeploymentPreference; it is part of CanarySetting.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates mistakenly apply canary settings directly to the API Gateway resource or use incorrect property names like `Percentage` or `TrafficShiftType`, instead of recognizing that SAM delegates canary traffic management to the Lambda function's `DeploymentPreference` with the correct `CanarySetting` structure.
Detailed technical explanation
How to think about this question
Under the hood, SAM generates an AWS CodeDeploy application and deployment group for each Lambda function with `DeploymentPreference` set. The `CanarySetting` property defines the initial traffic percentage and the interval (via `CanaryInterval`) before shifting all traffic to the new version. This is implemented using Lambda aliases and traffic routing, where CodeDeploy gradually updates the alias's routing configuration to shift traffic between the old and new versions.
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
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this DVA-C02 question test?
Deployment — This question tests Deployment — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Set Type: Canary in the DeploymentPreference of the Lambda function and add CanarySetting: { Percent: 10 } under DeploymentPreference. — Option A is correct because AWS SAM's `DeploymentPreference` with `Type: Canary` on the Lambda function enables canary traffic shifting for the API Gateway integration. The `CanarySetting` property with `Percent: 10` specifies that 10% of traffic is initially routed to the new Lambda version, while the remaining 90% goes to the previous version. This configuration leverages SAM's built-in CodeDeploy integration to manage the canary release automatically.
What should I do if I get this DVA-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 24, 2026
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