title: At what OSI layer do AWS Security Groups operate?
body: <p>I've read couple of articles about AWS Security Groups:</p>
  <ul>
  <li><a href="https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-security-groups.html" rel="nofollow noreferrer">Amazon EC2 security groups for Linux instances</a></li>
  <li><a href="https://docs.aws.amazon.com/vpc/latest/userguide/VPC_SecurityGroups.html" rel="nofollow noreferrer">Security Groups for your VPC</a></li>
  </ul>
  <p>but couldn't find at which OSI layer Security Groups operate. Maybe someone can help me understand at which OSI layer they operate?</p>