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AWS Certified Solutions Architect study material · question 222 of 500

How does reserved concurrency protect the resources behind a Lambda function?

  1. It retries failed invocations against a second Region
  2. It queues invocations until the downstream system acknowledges
  3. It caps the function's concurrency so it cannot overwhelm downstream systems
  4. It pre-initializes execution environments to reduce cold starts
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Answer: C. It caps the function's concurrency so it cannot overwhelm downstream systems

Reserved concurrency acts as both a floor and a ceiling, guaranteeing room to scale while preventing the function from overloading what sits behind it.

Source: Understanding Lambda function scaling (Amazon Web Services) — Reserved concurrency

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