DVA-C02 Question #449: Real Exam Question with Answer & Explanation

Question

A company has a serverless application that uses an Amazon API Gateway API to invoke an AWS Lambda function. A developer creates a fix for a defect in the Lambda function code. The developer wants to deploy this fix to the production environment. To test the changes, the developer needs to send 10% of the live production traffic to the updated Lambda function version. Which combination of steps will meet these requirements? (Choose two.)

Options

• APublish a new version of the Lambda function that contains the updated code.
• BSet up a new stage in API Gateway with a new Lambda function version. Enable weighted routing
• CCreate an alias for the Lambda function. Configure weighted routing on the alias. Specify a 10%
• DSet up a routing policy on a Network Load Balancer. Configure 10% of the traffic to go to the new
• ESet up a weighted routing policy by using Amazon Route 53. Configure 10% of the traffic to go to

Explanation

Lambda traffic shifting uses function aliases with weighted routing to canary-test a new version against live production traffic.

Common mistakes.

• B. API Gateway stages do not natively support weighted routing between Lambda function versions; traffic splitting for Lambda is handled at the alias level.
• D. Network Load Balancers operate at Layer 4 and are not designed to route traffic between Lambda function versions.
• E. Route 53 weighted routing distributes traffic between different DNS endpoints (e.g., separate ALBs or IPs), not between versions of the same Lambda function.

Concept tested. Lambda alias weighted traffic shifting for canary deployments

Reference. https://docs.aws.amazon.com/lambda/latest/dg/configuration-aliases.html

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