AWS Certified Advanced Networking Specialty Practice Exam

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What is the recommended setup for ensuring high availability of a NAT gateway?

  1. One NAT gateway in the public subnet

  2. One NAT gateway per Availability Zone

  3. Multiple NAT gateways in a single Availability Zone

  4. Using a single NAT instance for all traffic

The correct answer is: One NAT gateway per Availability Zone

To ensure high availability of a NAT gateway, deploying one NAT gateway per Availability Zone is the best practice. This approach allows for redundancy and fault tolerance. If one Availability Zone experiences an outage, the NAT gateway in another Availability Zone will still be operational, ensuring that instances in private subnets can maintain outbound connectivity to the internet for tasks such as software updates and accessing external services. Consolidating multiple NAT gateways in a single Availability Zone or using a single NAT instance would create a single point of failure. If the NAT gateway or instance in that specific Availability Zone experiences any issues, all traffic routed through it would be disrupted, leading to outages for all dependent resources. Therefore, having a NAT gateway in each Availability Zone preserves continuity of service and maximizes resiliency.

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