This guide provides a practical framework for securing operational technology (OT) and IoT environments through network segmentation aligned with industry standards such as the Purdue Model, IEC 62443, and NIST frameworks. It explains how segmentation reduces attack surfaces, prevents lateral movement, and protects critical systems while maintaining operational continuity. The playbook includes a phased approach covering discovery, design, deployment, and validation, along with detailed guidance on zone design, conduit architecture, and monitoring strategies. It also outlines key technologies such as industrial firewalls, asset discovery tools, and SIEM platforms. By combining security best practices with operational considerations, the guide helps organizations implement resilient, compli

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