This ebook explains how Zero Trust Device Segmentation helps organizations secure branches, campuses, factories, and critical IT/OT environments against lateral cyber threats. As IoT, OT, and Industry 4.0 technologies expand enterprise attack surfaces, traditional segmentation methods such as VLANs, NAC, ACLs, and east-west firewalls become difficult to scale and leave security gaps. The guide introduces an agentless approach that automatically discovers and classifies devices, isolates every endpoint into its own "network of one," and enforces dynamic, least-privilege access policies without disrupting operations. It also explores telco-inspired security principles, rapid deployment, visibility across IT and OT assets, and protection for legacy devices that cannot support security agents.

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