Security Groups

  • A security group acts as a virtual firewall to control inbound and outbound traffic for your Elastic Network Interfaces (ENIs).

  • Security groups are applied at the ENI level, not the subnet level.

⚙️ Key Features

  • Inbound & Outbound Traffic:

    • Inbound: Controls the traffic coming into an ENI.

    • Outbound: Controls the traffic leaving an ENI.

  • Stateful:

    • If you allow incoming traffic, the response traffic is automatically allowed, regardless of outbound rules.

  • Applies to ENIs:

    • Security groups are associated with ENIs, meaning they can be applied to individual network interfaces in your instances.

🧠 Quick Summary

Feature
Description

Purpose

Control inbound and outbound traffic at the ENI level

Applied To

Elastic Network Interfaces (ENIs)

Stateful Nature

Automatically allows return traffic for approved inbound traffic

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