networks top-level element 
A network is a block that represents a virtual network and its associated subnets, routes, and base networking components.
A network has the same schema as a block.
Examples 
AWS VPC 
yaml
networks:
  network0:
    module: nullstone/aws-network
    vars:
      cidr: "10.0.0.0/16"
      private_subnets:
        - "10.0.1.0/24"
        - "10.0.2.0/24"
        - "10.0.3.0/24"
      public_subnets:
        - "10.0.101.0/24"
        - "10.0.102.0/24"
        - "10.0.103.0/24"Attributes 
module 
See blocks#module.
module_version 
vars 
See blocks#vars.
connections 
See blocks#connections.