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AWS Certified Solutions Architect study material · question 174 of 500

Which two behaviours does Amazon EC2 Auto Scaling provide without any manual intervention? Choose two.

  1. Migrating instances to another Region when one Region fails
  2. Rewriting the application to be stateless
  3. Replacing instances that are terminated or impaired to restore desired capacity
  4. Spreading instances evenly across the Availability Zones named for the group
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Answer: C. Replacing instances that are terminated or impaired to restore desired capacity
D. Spreading instances evenly across the Availability Zones named for the group

Auto Scaling uses EC2 health checks to replace failed instances and balances capacity across the zones the group lists. It does not cross Regions.

Source: What is Amazon EC2 Auto Scaling? (Amazon Web Services) — Monitoring the health of running instances

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