Read the original article: AWS Security Groups Basics
Introduction
Security Groups are one of the fundamental concepts you need to learn when you are setting up infrastructure in AWS. Having a good understanding of their workings will help you not only design proper access for your EC2 instances but you will be also able to quickly spot and deal with issues with existing designs.
We have been using security groups in the earlier posts in this series and today we will learn a little bit more about those.
AWS Security Groups Basics