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AWS Certified Solutions Architect - Associate · AWS
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NAT Gateways always have to part of public subnet. We can then create a destination to these NAT Gateways in the private route table.
NAT Gateways are much better here as they can easily scale and provide high availability. NAT instances cant provide scalability and HA. Internet Gateway is 2-way and not suitable here. Egress-only is used for IPv6.
You have to create 3 NAT gateways but in the private subnet. Public and Private Subnets are the name of the concept . A public subnet is a subnet with a route to the internet gateway , private subnet doesn't have a route to the internet gateway. In this case the private subnets must have the NAT Gateway/NAT Instances , not the public subnet because if we are defined a subnet as public it means that this subnet has a route to the IG.