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AWS Certified Solutions Architect study material · question 236 of 500

A workload must survive an Availability Zone failure. Which design choice addresses this directly?

  1. Launching resources into subnets in separate Availability Zones
  2. Enabling versioning on the application's S3 bucket
  3. Using a larger instance type
  4. Attaching a second security group to each instance
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Answer: A. Launching resources into subnets in separate Availability Zones

A subnet sits in one zone, so spreading resources across subnets in different zones is what shields the application from one zone failing.

Source: Subnets for your VPC (Amazon Web Services) — Subnet basics

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