If you've provisioned a VPC from a Terraform module without fully internalising what each piece is doing, that's fine — right up until something breaks. An instance that should be reachable isn't. A private instance can't pull a package update.

Source: [Dev.to](https://dev.to/aloknecessary/aws-vpc-networking-fundamentals-vpcs-subnets-cidr-route-tables-igw-and-nat-gateways-19h1)

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