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Security Groups

Stateful firewalls attached to cloud resources (instances, services) that allow or deny inbound and outbound traffic by rules. A core building block of cloud network security every cloud engineer uses.

Cloud security groups are virtual firewalls associated with individual resources, evaluating allow rules for traffic in and out. Because they are stateful, return traffic is automatically allowed, simpler than stateless ACLs. They are the primary way cloud engineers define what each instance or service may communicate with, complementing subnet-level network ACLs and broader segmentation. Defining tight, least-privilege security groups is foundational to cloud network defense and a frequent posture-assessment focus.

Introduced in: Cloud Security Engineer Fundamentals

Examples

  • Allowing only specific source IPs and ports to an instance.
  • Defining tight, least-privilege security groups per workload.
  • Combining security groups with network ACLs for layered control.