Best practices and recommendations

The following are some key best practices and recommendations to keep in mind when using VPCs:

• Plan and design your VPC before actually implementing one. Determine the right choice of subnet that your application will need and build your VPC around it.

• Choose your VPC's network block allocation wisely. A /16 subnet can provide you with a potential 65,534 IP addresses that rarely will get utilized. So ideally, go for a /18 (16,382 IP addresses) or a /20 (4094 IP addresses) as your VPC network choice.

• Always plan and have a set of spare IP address capacity for your VPC. For example, consider the network block for my VPC as 192.168.0.0/18.

• In this case, we design the subnet IP addressing as follows:

  • 192.168.32.0/19 Public Subnet

  • 192.168.64.0/19 Public Subnet spares

  • 192.168.128.0/20 Private Subnet

  • 192.168.192.0/20 Private Subnet spares

• Remember that you cannot edit a network block's size once it is created for a VPC. The only way to change the network block is by...