PR.PT-4 Network Protection: Secure Your Communications Infrastructure
Network protection is foundational to any cybersecurity program. NIST CSF control PR.PT-4 requires organizations to implement safeguards that prevent unauthorized access to and disruption of communications and control networks. For SMBs managing compliance without enterprise-scale resources, understanding and documenting network protections is critical to avoiding costly breaches.
What this means
PR.PT-4 requires you to establish and maintain technical controls that protect the confidentiality, integrity, and availability of your communications and control networks. This includes both data networks and operational technology (OT) environments. The control focuses on preventing unauthorized access, ensuring secure communication channels, and maintaining network resilience against disruption.
How to comply
- 1.Deploy firewalls and network segmentation to isolate critical systems and control networks from general-purpose networks and the internet
- 2.Implement network access controls including authentication and encryption for all communications channels
- 3.Monitor and log all network traffic to detect and respond to unauthorized access attempts or anomalies
- 4.Maintain network architecture documentation showing data flows, boundaries, and protection mechanisms
- 5.Regularly test network defenses through vulnerability assessments and penetration testing
- 6.Implement intrusion detection or prevention systems to identify suspicious network activity in real-time
- 7.Apply network hardening standards including disabling unused ports and services on network devices
Evidence auditors look for
- Firewall configuration files and ruleset documentation with change logs
- Network segmentation diagrams showing DMZs, VLANs, and isolated control networks
- VPN or encrypted communication channel documentation for remote access
- Network access control lists (ACLs) and authentication mechanism configurations
- Security log aggregation and monitoring alerts from firewalls, IDS/IPS, or SIEM systems
- Vulnerability assessment and penetration test reports with remediation evidence
- Network device hardening checklists and configuration standards documentation
- Incident response logs documenting detected and blocked unauthorized access attempts
Frequently asked questions
When will FAQs be available?
The FAQ for this control is currently being prepared.
GRCWatch automatically maps your firewall configurations, network diagrams, and access logs to PR.PT-4 evidence, eliminating manual documentation and reducing the time to prove network protection compliance.
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