ethernet ip , profinet , secure remote access , Nat, Vpn, Wireshark, Zones, Vlans, Plc, industrial network troubleshooting, Segmentation, redundancy, DCS integration, basic packet analysis, IEC 62443, Policy, SCADA, conduits, Modbus TCP, high availability design, industrial switch configuration, IT OT segregation design, OPC-UA, legacy system handling, OT cybersecurity, plant network operations, Phoenix Contact mGuard firewall, ring topology