Security Group AWS

  • All inbound traffic is blocked by default
  • All outbound traffic is Allowed by default
  • Changes to Security Group take effect immediately
  • You can have any number of EC2 instances within a security group
  • You can have multiple security groups attached to EC2 instance
  • Security Groups are STATEFULL
    • If you create an inbound rule allowing traffic in, That traffic is automatically allowed back out again
  • You cannot block specific IP addresses using security groups, instead use Network Access Control Lists
  • You cannot add a deny rule
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