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Application & OT Security · Intermediate

Segmentation Testing

Testing that verifies network segmentation controls actually isolate sensitive zones from other networks.

Definition

Testers attempt to reach protected segments, such as a cardholder data environment, from out-of-scope networks to confirm firewall rules and ACLs block all unauthorized paths. PCI DSS requires segmentation testing to validate scope reduction. Port scans from each segment are a common technique.

Example

From the corporate LAN, a tester runs a full TCP/UDP port scan against the CDE subnet and finds no open ports.

Exam tip

If segmentation is not validated, the entire network may be considered in PCI scope.

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