AWS Security Group Characteristics:

Security group characteristics:

  • Every EC2 instance must have at least one security group.
  • The same security group can be associated with multiple EC2 instances.
  • Every EC2 instance can have max 5 security groups
  • A security group has both inbound and outbound rules
  • Security groups are stateful
  • If traffic is initiated from the internet, traffic is validated by inbound rules of security groups.
  • If traffic is initiated from EC2, his traffic is validated by outbound rules of security groups.
  • When we update rule under security group, it takes effect immediately.
  • Security group does not have explicit allow/deny, rules we add are allowed and others are implicitly denied.


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