- A
Create a Lambda alias that points to the current version and configure routing to shift a percentage of traffic to the new version.
Alias routing enables canary deployments.
- B
Configure Amazon CloudFront to distribute traffic between two API Gateway endpoints.
Why wrong: CloudFront is not needed for canary deployments.
- C
Update the API Gateway integration to point to the Lambda alias instead of a specific version.
API Gateway should invoke the alias to benefit from routing.
- D
Update the Lambda function code and publish a new version.
Why wrong: This creates a new version but does not shift traffic.
- E
Create a new API Gateway stage for the new version and update DNS.
Why wrong: Overly complex; canary can be done with alias.
Question 736 of 1,616
Lambda Canary Deployment with Alias Routing
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 new version of an AWS Lambda function. The function is behind an API Gateway endpoint. The developer wants to use canary deployments to gradually shift traffic to the new version. Which TWO steps should the developer perform?
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
✓
Create a Lambda alias that points to the current version and configure routing to shift a percentage of traffic to the new version.
Option A is correct because Lambda aliases support traffic shifting for canary deployments by allowing you to route a percentage of incoming requests to a new function version while the majority continues to the current version. This is done by configuring the alias's routing configuration with a `RoutingConfig` that specifies the new version and the weight (e.g., 5%) of traffic it should receive. This enables gradual, controlled rollouts without modifying the API Gateway integration endpoint. Option C is also necessary because the API Gateway integration must point to the Lambda alias (rather than a fixed version) so that the routing configuration on the alias can take effect. Without updating the integration to use the alias, API Gateway would continue to invoke a specific version directly, bypassing the canary routing.
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.
- ✓
Create a Lambda alias that points to the current version and configure routing to shift a percentage of traffic to the new version.
Why this is correct
Alias routing enables canary deployments.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Configure Amazon CloudFront to distribute traffic between two API Gateway endpoints.
Why it's wrong here
CloudFront is not needed for canary deployments.
- ✓
Update the API Gateway integration to point to the Lambda alias instead of a specific version.
Why this is correct
API Gateway should invoke the alias to benefit from routing.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Update the Lambda function code and publish a new version.
Why it's wrong here
This creates a new version but does not shift traffic.
- ✗
Create a new API Gateway stage for the new version and update DNS.
Why it's wrong here
Overly complex; canary can be done with alias.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often think canary deployments require separate infrastructure (like CloudFront or multiple stages), but AWS Lambda aliases with routing configuration provide a built-in, serverless-native mechanism for percentage-based traffic shifting without additional services.
Detailed technical explanation
How to think about this question
Lambda alias routing uses a `RoutingConfig` object where you specify the new version and a `additionalVersionWeights` value (e.g., 0.05 for 5%). The alias's `functionVersion` points to the stable version, and the routing config sends the specified percentage of invocations to the new version. This works seamlessly with API Gateway because the integration points to the alias ARN, so the alias handles the traffic split transparently. In a real-world scenario, you can monitor error rates and roll back by updating the alias to point entirely to the stable version, or gradually increase the weight to 100%.
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
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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: Create a Lambda alias that points to the current version and configure routing to shift a percentage of traffic to the new version. — Option A is correct because Lambda aliases support traffic shifting for canary deployments by allowing you to route a percentage of incoming requests to a new function version while the majority continues to the current version. This is done by configuring the alias's routing configuration with a `RoutingConfig` that specifies the new version and the weight (e.g., 5%) of traffic it should receive. This enables gradual, controlled rollouts without modifying the API Gateway integration endpoint. Option C is also necessary because the API Gateway integration must point to the Lambda alias (rather than a fixed version) so that the routing configuration on the alias can take effect. Without updating the integration to use the alias, API Gateway would continue to invoke a specific version directly, bypassing the canary routing.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Same concept, more angles
1 more ways this is tested on DVA-C02
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A company is deploying a new microservice on AWS Lambda behind an API Gateway. The development team wants to ensure that new versions of the Lambda function can be rolled out gradually and automatically rolled back if error rates exceed a threshold. Which deployment strategy should the team use?
medium- ✓ A.Use AWS CodeDeploy with a canary deployment strategy that shifts 10% of traffic to the new version for 5 minutes, then shifts the remaining 90%. Configure a CloudWatch alarm to automatically roll back if error rates exceed 2%.
- B.Use AWS Lambda function aliases with weighted alias traffic shifting. Update the weights manually and monitor error rates using CloudWatch. Roll back by reverting the alias weights.
- C.Use AWS CodeDeploy with a linear deployment strategy that shifts 10% of traffic every 5 minutes. Configure a CloudWatch alarm to monitor error rates and manually roll back if needed.
- D.Use AWS CodeDeploy with a blue/green deployment and an Application Load Balancer (ALB) to shift traffic to the new version. Configure CloudWatch alarms to trigger a rollback if errors exceed 5%.
Why A: Option A is correct because AWS CodeDeploy supports canary deployments for Lambda functions, enabling gradual traffic shifting (e.g., 10% for 5 minutes) and automatic rollback via CloudWatch alarms when error rates exceed a threshold. This matches the team's requirements. Option B is incorrect because manual weight updates and monitoring do not provide automatic rollback. Option C is incorrect because it specifies manual rollback, not automatic. Option D is incorrect because blue/green deployments with an ALB are not natively integrated with Lambda behind API Gateway, and the question specifies automatic rollback based on error rates, which is more directly supported by CodeDeploy canary with CloudWatch alarms.
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Last reviewed: Jul 4, 2026
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