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VPC: Virtual Private Cloud

Within a region, you’re able to create VPCs. Each VPC contain subnets (networks). Each subnet must be mapped to an AZ. It’s common to have a public ip and private ip subnet. It’s common to have many subnets per AZ.

Public Subnets usually contain:

  • Load Balancers
  • Static Websites
  • Files
  • Public Authentication Layers

Private Subnets usually contain:

  • Web application servers
  • Databases

Public and Private subnets can communicate if they’re in the same VPC

AWS VPC Summary

  • VPC & Regions aren’t much asked at the developer associate exam
  • All new accounts come with a default VPC
  • It’s possible to use a VPN to connect to a VPC
  • VPC flow logs allow you to monitor the traffic within, in and out of your VPC (useful for security, performance, audit)
  • VPC are per Account per Region
  • Subnets are per VPC per AZ
  • Some AWS resources can be deployed in VPC while others can’t
  • You can peer VPC (within or across accounts) to make it look like they’re part of the same network