AWS Serverless Computing 4

Question 1

Which AWS Lambda feature allows you to run a function for up to 15 minutes without a cold start penalty on subsequent invocations?

Accepted Answer

Provisioned Concurrency

Answer

Provisioned Concurrency keeps Lambda execution environments initialized and ready, eliminating cold starts for latency-sensitive applications.

Question 2

An AWS Lambda function needs to access a secret stored in AWS Secrets Manager without hardcoding credentials. What is the recommended approach?

Accepted Answer

Attach an IAM role with GetSecretValue permission to the Lambda function

Answer

Attaching an IAM execution role with Secrets Manager permissions is the secure, recommended way to grant Lambda access to secrets.

Question 3

What happens to an AWS Lambda function's environment variables when you publish a new version?

Accepted Answer

Environment variables are snapshot into the published version and cannot be changed

Answer

When you publish a Lambda version, the configuration including environment variables is frozen and immutable for that version.

Question 4

Which EventBridge (CloudWatch Events) feature enables you to send events from an AWS Lambda function to multiple downstream targets simultaneously?

Accepted Answer

Event buses with multiple rules

Answer

EventBridge rules on an event bus can match a single event and route it to multiple targets concurrently, enabling fan-out patterns.

Question 5

A Step Functions state machine needs to wait for a human approval before proceeding. Which integration pattern should be used?

Accepted Answer

Wait for Task Token (.waitForTaskToken)

Answer

The waitForTaskToken pattern pauses execution until an external process calls SendTaskSuccess or SendTaskFailure with the provided token.

AWS Practice Test