What does it mean when cardholder data is segmented in a network?

When cardholder data is segmented in a network, it means that this sensitive information is isolated from systems that do not process or handle such data. This segmentation is a critical component of maintaining security and compliance with standards like PCI DSS. By separating cardholder data from other parts of the network, organizations can reduce the risk of unauthorized access and mitigate potential data breaches.

For instance, if cardholder data is stored and processed in a dedicated environment, with restrictions on access to only those individuals and systems that need it, this creates a clear boundary that helps to protect the data from being exposed to other, potentially less secure parts of the network. This approach not only enhances security but also simplifies compliance efforts, as fewer systems are in scope for PCI DSS requirements.

In contrast, keeping cardholder data on a single server, securing it through encryption, or deleting it after use do not specifically relate to the concept of segmentation within a network. While these practices can also be important for the overall security of cardholder data, they do not directly address the notion of isolating data from other systems, which is the focus of this question.