Before addressing individual requirements, reduce the scope of the cardholder data environment (CDE) itself. The single most effective way to lower PCI DSS cost and audit burden is to minimize how much of the network touches cardholder data in the first place.

• Use tokenization or a validated third-party payment processor so cardholder data never touches internal systems.
• Segment the CDE from the rest of the network so systems outside the CDE fall out of scope.
• Eliminate storage of full card numbers, magnetic stripe data, or CVV wherever business processes allow.

• Build and Maintain a Secure Network — install and maintain firewall configurations; do not use vendor-supplied defaults.
• Protect Cardholder Data — protect stored data; encrypt transmission across open, public networks.
• Maintain a Vulnerability Management Program — use and update anti-malware; develop and maintain secure systems and applications.
• Implement Strong Access Control Measures — restrict access by business need-to-know; assign unique IDs; restrict physical access.
• Regularly Monitor and Test Networks — track and monitor all access to network resources and cardholder data; test security systems regularly.
• Maintain an Information Security Policy — maintain a policy addressing information security for personnel and third parties.

• Keep network segmentation validated with periodic penetration testing, not just a one-time diagram.
• Minimize the number of systems, people, and locations that store or process cardholder data.
• Standardize configurations across in-scope systems so evidence collection is consistent, not custom per system.
• Maintain continuous evidence (logs, scan results, change records) rather than reconstructing it at audit time.

• PCI DSS 4.0 Overview — /knowledge-center/compliance/compliance-governance/pci-dss-40-overview
• Compliance Fundamentals — /knowledge-center/compliance/compliance-governance/compliance-fundamentals