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AWS handles firewall configuration using Security Groups. Every EC2 instance or other service with an Elastic Network Interface (ENI) uses your security group configuration to decide which packets to drop and what type of traffic should be allowed.

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Source: https://www.cloudsavvyit.com/12059/what-are-aws-security-groups-and-how-do-you-use-them/
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The Article Was Written/Published By: Anthony Heddings