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 developer is deploying a serverless application using the AWS Serverless Application Model (SAM). The application includes an Amazon API Gateway HTTP API and several AWS Lambda functions. The developer wants to implement a canary deployment for the API Gateway stage so that 10% of traffic is shifted to the new version for 30 minutes before the remaining 90% is shifted. Which SAM resource attribute should the developer configure on the API Gateway resource?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
DeploymentPreference
The `DeploymentPreference` attribute on an AWS::Serverless::Api resource in SAM enables canary deployments by allowing you to specify traffic-shifting patterns, such as `Canary10Percent30Minutes`. This shifts 10% of traffic to the new API Gateway stage for 30 minutes before rolling out the remaining 90%, exactly matching the requirement.
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.
✗
AutoPublishAlias
Why it's wrong here
AutoPublishAlias is used to automatically create a Lambda version and alias; it does not affect API Gateway traffic shifting.
✓
DeploymentPreference
Why this is correct
DeploymentPreference with a Canary setting enables gradual traffic shifting for the API Gateway stage.
Related concept
Read the scenario before looking for a memorised answer.
✗
ProvisionedConcurrencyConfig
Why it's wrong here
This configures provisioned concurrency for Lambda functions, not API traffic shifting.
✗
EventInvokeConfig
Why it's wrong here
EventInvokeConfig controls retries and maximum age for asynchronous Lambda invocations, not API traffic.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse `AutoPublishAlias` (which manages Lambda versioning) with `DeploymentPreference` (which manages API Gateway stage traffic shifting), leading them to pick A when the question explicitly asks about API Gateway canary deployments.
Detailed technical explanation
How to think about this question
Under the hood, SAM's `DeploymentPreference` leverages AWS CodeDeploy to perform the canary traffic shift by creating a second API Gateway stage and using a weighted alias to route traffic. The `Canary10Percent30Minutes` setting creates a deployment group in CodeDeploy that monitors CloudWatch alarms during the 30-minute window, and if no alarms trigger, it automatically shifts the remaining 90% of traffic. This is distinct from a simple linear deployment because it allows for a safe observation period before full rollout.
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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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: DeploymentPreference — The `DeploymentPreference` attribute on an AWS::Serverless::Api resource in SAM enables canary deployments by allowing you to specify traffic-shifting patterns, such as `Canary10Percent30Minutes`. This shifts 10% of traffic to the new API Gateway stage for 30 minutes before rolling out the remaining 90%, exactly matching the requirement.
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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Question Discussion
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