A SysOps Administrator has implemented a VPC network design with the following requirements:✑ Two Availability Zones (AZs)✑ Two private subnets✑ Two public subnets✑ One internet gateway✑ One NAT gatewayWhat would potentially cause applications in the VPC to fail during an AZ outage?
A single virtual private gateway, because it can be associated with a single AZ only.
A single internet gateway, because it is not redundant across both AZs.
A single NAT gateway, because it is not redundant across both AZs.
The default VPC route table, because it can be associated with a single AZ only.
Explanations:
A virtual private gateway is not associated with a specific AZ, and can be used across all AZs.
An internet gateway is a regional resource and is automatically available across all AZs.
A NAT gateway is an AZ-specific resource. If the AZ hosting the NAT gateway goes down, private subnets lose internet access.
The default VPC route table is not AZ-specific, and it applies to all subnets in the VPC.
As I understand it, the answer is:
A single NAT gateway, because it is not redundant across both AZs.
I rank that the answer is:
A single NAT gateway, because it is not redundant across both AZs.