AWS Certified Developer Associate Practice Test 4

Correct answer - "Use AWS Lambda aliases" : By default, an alias points to a single Lambda function version. When the alias is updated to point to a different function version, incoming request traffic in turn instantly points to the updated version. This exposes that alias to any potential instabilities introduced by the new version. To minimize this impact, you can implement the routing-config parameter of the Lambda alias that allows you to point to two different versions of the Lambda function and dictate what percentage of incoming traffic is sent to each version.

Incorrect:

"Use environment variables" - Environment variables for Lambda functions enable you to dynamically pass settings to your function code and libraries, without making changes to your code

"Use Route 53" - Unfortunately Route 53 cannot shift traffic between Lambda versions and is better served shifting internet traffic

"Deploy your Lambda in a VPC" - Configuring a VPC is more for security purposes

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