Recommend network and infrastructure equipment: industrial switches, routers, firewalls, media converters, gateways, to include weighing environmental ratings, form factor, PoE budgets, protocol support, lifecycle, and spares. Know the protocols in our stack: Modbus TCP/RTU, DNP3, IEC 61850, IEC 60870-5-104, OPC UA, MQTT, to include their bandwidth, timing, and segmentation implications, and how to troubleshoot them at the packet level.