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AWS Certified Solutions Architect study material · question 220 of 500

Instances are launched without any placement group. How does EC2 place them?

  1. Spread across the underlying hardware to limit correlated failures
  2. Packed onto as few hosts as possible to reduce latency
  3. On dedicated hosts reserved for the account
  4. In a single Availability Zone chosen at random
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Answer: A. Spread across the underlying hardware to limit correlated failures

Placement groups are optional; without one EC2 still tries to spread instances so a single failure affects as few as possible.

Source: Placement groups for your Amazon EC2 instances (Amazon Web Services) — Placement groups

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