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AWS Certified Solutions Architect study material · question 421 of 500

How does a Lambda function get invoked?

  1. A scheduler polls the function every minute
  2. An EC2 instance calls it over a private endpoint
  3. The function polls its own queue on startup
  4. A handler is connected to a trigger such as API Gateway, S3, SQS or EventBridge
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Answer: D. A handler is connected to a trigger such as API Gateway, S3, SQS or EventBridge

Lambda runs the handler whenever its trigger fires, and over 200 AWS services can act as that trigger.

Source: What is AWS Lambda? (Amazon Web Services) — What is AWS Lambda?

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