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AWS Certified Solutions Architect study material · question 415 of 500

Which two effects does setting reserved concurrency on a Lambda function have? Choose two.

  1. It raises the account's overall concurrency limit
  2. It guarantees that function a slice of the account's concurrency
  3. It caps that function so it cannot exceed the reserved amount
  4. It pre-initializes execution environments to cut cold starts
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Answer: B. It guarantees that function a slice of the account's concurrency
C. It caps that function so it cannot exceed the reserved amount

Reserved concurrency acts as both a floor and a ceiling. Pre-initializing environments is what provisioned concurrency does.

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

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