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Question 40 of 129
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Select 2 answers.
This question asks for 2 answers, but our data marks only 1. Compare with the community discussion below for the full answer.
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I think the correct answers are A and E. The question is a little ambiguous, but if "NAT gateways spanning multiple Availability Zones" means placing a NAT gateway in each AZ, then I think the correct answer is E, not D. In the first place, I think D still results in a single point of failure, but what do you think?
https://aws.amazon.com/blogs/networking-and-content-delivery/using-nat-gateways-with-multiple-amazon-vpcs-at-scale/ NAT Gateways within an AZ are automatically implemented with redundancy. However, while Amazon VPCs can span multiple AZs, each NAT Gateway operates within a single AZ. If the NAT Gateway fails, then connections with resources using that NAT Gateway also fail. Therefore, it's recommended to deploy one NAT Gateway in each AZ and routing traffic locally within the same AZ.
Both NAT Gateway and NAT instance are regional resources. But NAT Gateway offers automatic deployment across Availability Zones, you might need to manually configure redundancy across Availability Zones for NAT Instances.