AWS - Security Groups

Security Group

• All inbound traffic is blocked by default.
• All outbound traffic is allowed.
• Changes to security group takes effect immediately.
• You can have any number of EC2 instances within a security group.
• Multiple security group attached to an EC2 instance.
• Security groups are STATEFUL (A service that is actively processing state data).
• You can not block specific IP address using security group instead use NACL.
• You can specify allow rules but not deny rules.