Creates a default subnet with a size "/20" IPv4 CIDR block in thespecified Availability Zone in your default VPC.Show details from next link. https://docs.aws.amazon.com/ja_jp/cli/latest/reference/ec2/create-default-subnet.html
| aws ec2 create-default-subnet --availability-zone us-east-2a |
| create-default-vpc — AWS CLI 1.16.6 Command Reference : http://docs.aws.amazon.com/cli/latest/reference/ec2/create-default-subnet.html |
| aws ec2 create-default-subnet --availability-zone |
| amazon web services - Is there a way for cloudformation to query available zones for subnet creation? - Stack Overflow : http://stackoverflow.com/questions/21390444/is-there-a-way-for-cloudformation-to-query-available-zones-for-subnet-creation/30614960 |