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AWS Certified Solutions Architect study material · question 337 of 500

Can a subnet span two Availability Zones?

  1. Yes, if the VPC has an IPv6 CIDR block
  2. Yes, when cross-zone load balancing is enabled
  3. Yes, for subnets larger than a /20
  4. No, a subnet sits entirely inside one Availability Zone
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Answer: D. No, a subnet sits entirely inside one Availability Zone

Every subnet lives in exactly one zone, which is why resilience comes from placing resources in subnets in different zones.

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

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