Security group

• Controls inbound and outbound traffic for an Amazon EC2 instance.
• By default:
  • denies all inbound traffic and allows all outbound traffic.
  • you can associate EC2 instances with the same security group or use different security groups for each instance.
• uses stateful packet filtering. They remember previous decisions made for incoming packets.
  • Security group remembers request and doesn't check response

References

1. https://explore.skillbuilder.aws/learn/course/external/view/elearning/1851/aws-technical-essentials?da=sec&sec=prep Module 3
2. AWS user guide: Control Traffic to Resources Using Security Groups
3. https://explore.skillbuilder.aws/learn/course/134/play/85854/aws-cloud-practitioner-essentials Module 4