The paper outlines Zscaler’s Zero Trust-based segmentation strategy for securing interconnected OT/IoT systems in Industry 4.0 manufacturing environments. It highlights the need for robust network segmentation to mitigate lateral cyber threats in legacy industrial systems. Using the Purdue Model, the paper categorizes device risk levels and presents five use cases: securing internet communications, bridging OT/IT networks, segmenting operations and supervisory levels, and controlling communications among PLCs and HMIs. Zscaler’s solution enables agentless, network-agnostic segmentation with centralized policy management and threat containment without major infrastructure changes.

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