How to divide a plant network into zones, control what crosses between them, and why flat OT networks keep making incident reports.
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Segment assets; control every path between segments. — The IEC 62443 practice of grouping assets into zones by risk and function, with every inter-zone path an explicitly controlled conduit (firewall, diode, brokered connection). The core discipline of OT network segmentation.
TermIEC 62443
Core OT cybersecurity standard series. — The ISA/IEC industrial cybersecurity standard series: risk assessment, zones and conduits, component requirements, and lifecycle practices for industrial automation and control systems. The reference behind most OT security programs.
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