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What triggers an AWS Lambda function to run?

easy📝 Conceptual Q1 of 15
AWS - Lambda
What triggers an AWS Lambda function to run?
AScheduled daily at midnight by default
BAn event from a configured source
CManual login to AWS console
DOnly when a new EC2 instance is launched
Step-by-Step Solution
Solution:

  1. Step 1: Understand Lambda triggers

    A Lambda function runs when an event occurs from a configured source like S3, API Gateway, or DynamoDB.

  2. Step 2: Eliminate incorrect triggers

    Manual login, default schedules, or EC2 launches are not automatic Lambda triggers unless explicitly configured.

  3. Final Answer:

    An event from a configured source -> Option B

  4. Quick Check:

    Lambda trigger = event source [OK]
Quick Trick: Lambda runs on events, not manual or default schedules [OK]
Common Mistakes:
  • Thinking Lambda runs on manual AWS console login
  • Assuming Lambda runs on default daily schedule
  • Confusing EC2 launch with Lambda trigger

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