Individual skill
implementing-purdue-model-network-segmentation
Implement network segmentation based on the Purdue Enterprise Reference Architecture (PERA) model, separating ICS networks into hierarchical security zones from Level 0 physical process through Level 5 enterprise and enforcing strict traffic control through IEC 62443-aligned DMZs between OT and IT domains. Use when designing ICS/SCADA network zones or segmenting OT from IT networks.
skills/implementing-purdue-model-network-segmentation/SKILL.md
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# Implementing Purdue Model Network Segmentation
## When to Use
- When designing or retrofitting network architecture for an ICS/SCADA environment
- When implementing IEC 62443 zone and conduit requirements in a brownfield plant
- When creating the IT/OT DMZ (Level 3.5) to control data flow between enterprise and control networks
- When remediating audit findings about flat OT networks or direct IT-to-OT connectivity
- When segmenting a converged IT/OT network after an acquisition or merger
**Do not use** for micro-segmentation within a single Purdue level (see implementing-zone-conduit-model-for-ics), for cloud-native environments without traditional ICS networks, or for network segmentation in purely IT environments.
## Prerequisites
