This template creates a VPC architecture for medium-sized businesses. You can create three subnets in a VPC. ECS and SLB instances in FrontSubnet handle Internet requests. ECS, SLB, ApsaraDB for RDS, and ApsaraDB for Redis instances and OSS buckets in BackendSubnet provide core business logic. Instances in OtherSubnet access the Internet through the SNAT function of NAT Gateway.