- A
DeploymentPreference property on the AWS::Serverless::Function resource.
This property defines the canary traffic shifting and rollback behavior.
- B
AutoPublishAlias property on the AWS::Serverless::Function resource.
This property enables automatic version publishing and alias update for canary deployments.
- C
The function's CodeUri property pointing to the deployment package.
Why wrong: CodeUri is required for any deployment, not specific to canary.
- D
An event source mapping for the function.
Why wrong: Event source mapping is unrelated to canary deployment strategy.
- E
The function's alias resource with a routing configuration.
Why wrong: While an alias is used, the routing configuration is automatically handled by DeploymentPreference.
Question 849 of 1,616
SAM Canary Deployment Configuration — DeploymentPreference & AutoPublishAlias
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 using AWS SAM to deploy a serverless application. The developer wants to enable canary deployments for the Lambda function. Which TWO resources must be configured in the SAM template? (Choose TWO.)
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
✓
DeploymentPreference property on the AWS::Serverless::Function resource.
Option A is correct because the `DeploymentPreference` property on the `AWS::Serverless::Function` resource enables canary deployments by specifying a deployment strategy (e.g., `Canary10Percent5Minutes`). This tells AWS SAM to use AWS CodeDeploy to shift traffic gradually to the new Lambda version, allowing you to monitor for errors before full rollout. Without this property, SAM defaults to an all-at-once deployment, which does not support canary traffic shifting.
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.
- ✓
DeploymentPreference property on the AWS::Serverless::Function resource.
Why this is correct
This property defines the canary traffic shifting and rollback behavior.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
AutoPublishAlias property on the AWS::Serverless::Function resource.
Why this is correct
This property enables automatic version publishing and alias update for canary deployments.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The function's CodeUri property pointing to the deployment package.
Why it's wrong here
CodeUri is required for any deployment, not specific to canary.
- ✗
An event source mapping for the function.
Why it's wrong here
Event source mapping is unrelated to canary deployment strategy.
- ✗
The function's alias resource with a routing configuration.
Why it's wrong here
While an alias is used, the routing configuration is automatically handled by DeploymentPreference.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often think manually defining a Lambda alias with routing configuration (Option E) is sufficient for canary deployments, but SAM requires both `AutoPublishAlias` (to automate version publishing and alias management) and `DeploymentPreference` (to integrate with CodeDeploy for traffic shifting) — the alias resource alone does not trigger CodeDeploy or enable automated canary rollouts.
Detailed technical explanation
How to think about this question
Under the hood, when `AutoPublishAlias` is set, SAM automatically creates a Lambda alias (e.g., `live`) and publishes new versions. The `DeploymentPreference` property then configures an AWS CodeDeploy application and deployment group that uses the alias to shift traffic gradually, with pre- and post-traffic hooks for validation. A real-world scenario: using `Canary10Percent5Minutes` shifts 10% of traffic to the new version for 5 minutes; if CloudWatch alarms (configured via `Alarms`) trigger, CodeDeploy automatically rolls back to the previous version, preventing full outage.
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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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: DeploymentPreference property on the AWS::Serverless::Function resource. — Option A is correct because the `DeploymentPreference` property on the `AWS::Serverless::Function` resource enables canary deployments by specifying a deployment strategy (e.g., `Canary10Percent5Minutes`). This tells AWS SAM to use AWS CodeDeploy to shift traffic gradually to the new Lambda version, allowing you to monitor for errors before full rollout. Without this property, SAM defaults to an all-at-once deployment, which does not support canary traffic shifting.
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: Jul 4, 2026
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