Payment Card Industry (PCI) Data Security Standards Practice Test

Which of the following is correct regarding network segmentation?

1. Network segmentation is not a PCI DSS requirement

2. A properly segmented network increases the scope of a PCI DSS assessment

3. A segmented network is also known as a "flat network"

4. Network segmentation is required by PCI DSS for all in-scope networks

The correct answer is: Network segmentation is not a PCI DSS requirement

Network segmentation is a critical practice in the context of PCI DSS (Payment Card Industry Data Security Standards) as it aims to reduce the scope of PCI compliance by separating cardholder data environments from other parts of the network. This strategy helps in minimizing risks and improving security by isolating sensitive data and systems. The correct understanding regarding network segmentation highlights that a properly implemented segmentation strategy actually reduces the scope of a PCI DSS assessment. It enables organizations to focus on securing only those parts of the network that handle cardholder data, rather than the whole network. This targeted approach can make compliance efforts more manageable and efficient. Proper segmentation creates distinct zones within the network secured by additional layers of protection and monitoring, contrasting the idea of a "flat network" — which is unsegmented and presents greater risk due to the lack of restrictions on cardholder data access. Thus, while segmentation is not explicitly mandated for every part of the network, it is highly recommended as a best practice to enhance security and compliance. In summary, effective network segmentation plays a significant role in the PCI DSS context, primarily by reducing the compliance scope and protecting sensitive cardholder data more effectively.