Diagram for scenario 2: VPC with public and private subnets. The configuration for this scenario includes the following: A VPC with a size /16 IPv4 CIDR block . The following diagram shows a VPC that has been configured with subnets in multiple Availability Zones. 1A, 1B, 2A, and 3A are instances in your VPC. An IPv6 . Use this Quick Start to build a VPC environment with the following features on . For each Availability Zone, this Quick Start provisions one public subnet and . Jump to Subnet sizing - In the default subnet allocation, the VPC is divided into subnet types and then further segmented per Availability Zone, . Diagram for scenario 3: VPC with public and private subnets and VPN access. Important. For this scenario, the Amazon VPC Network Administrator Guide . Guidance for designing an Amazon VPC network, including general best practices, VPC and subnet sizing, and common single-VPC configurations. The following diagram shows the routing for a VPC with both an Internet gateway and a virtual private gateway, plus a public subnet and a VPN-only subnet.