AWS Cloud Series

Concise AWS VPC reference Guide

AWS | Cloud | Network

Arun Kumar Singh
6 min readNov 18, 2022


Photo by Taylor Vick on Unsplash


This post talks about few AWS Cloud VPC concepts in brief. I have not covered anything new in this post, but tried to collect important concepts that can give good idea of overall VPC specific AWS services. This post can also give good recap to those who are thinking of taking the AWS Certification Exams.

Let’s dive in ….


  • Own virtual network inside AWS, scattered through 4 virtual walls (region, AZ, IPv4, IPV6 CIDR block).
  • Spans through all AZs in an entire region
  • Can connect to other networks using VPN or using Direct Connect to physical networks (ex On Premises)


  • You need to create a subnet to use a VPC
  • Limited to a single AZ, provides routing boundaries
  • There is no concept of public or private subnet logically. A subnet becomes public when it has a default route to internet using Internet Gateway. All resources have public IP addresses assigned by default or not? Otherwise all subnets are private by default.
  • Public IP to the resources can be allocated by default or can be allocated…