Which scenario describes segmentation of the cardholder data environment (CDE) for the purposes of reducing PCI DSS scope?

The scenario that accurately describes segmentation of the cardholder data environment (CDE) for the purposes of reducing PCI DSS scope is the one that emphasizes a network configuration that prevents all network traffic between the CDE and out-of-scope networks. This method of segmentation is vital as it establishes strict boundaries between the sensitive systems that process, store, or transmit cardholder data and those that do not. By effectively isolating the CDE, organizations can ensure that compliance efforts are focused solely on the components that handle cardholder data, thereby streamlining the compliance process and reducing the necessary scope of the PCI DSS assessments.

Segmentation serves as a crucial control in minimizing the potential attack surface, as it restricts access to sensitive data and reduces possible exposure to non-compliant elements of the IT infrastructure. This approach allows organizations to manage risks more effectively, ensuring that even if breaches occur in out-of-scope systems, the cardholder data remains protected. Additionally, this segregation can facilitate a quicker response to PCI compliance audits and mitigate the overall burden of compliance by limiting the controls that must be implemented across the entire network.

The other scenarios presented do not align with effective segmentation principles:

• A shared network connection among multiple business functions could inadvertently expose the CDE to risks