This ebook provides practical guidance for moving segmentation projects from planning to enforcement in environments filled with unmanaged, IoT, OT, medical, facilities, and legacy devices. It identifies six blockers: mission-critical devices that are difficult to patch, inability to prove compliance controls, flat networks without proactive enforcement, inflexible policies that fail to stop lateral movement and exfiltration, stalled NAC initiatives, and tool sprawl or infrastructure transitions. The guide recommends prioritizing high-risk devices, building policies from device behavior and business context, aligning segmentation with HIPAA, PCI, NIST, and ISO evidence requirements, using existing NACs, ACLs, VLANs, and firewalls, integrating detection with dynamic containment, piloting en

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