Cisco Switch fiber trunk connecting IT and OT networks via ENF1-NS70339 and IE3000 Industrial Switch with multi-VLAN segmentation. The existing Cisco Switch routes traffic across VLAN 10, 20, and 255 access ports to the new IE3000 Industrial Switch over fiber SFP links. This architecture isolates industrial controllers (PLC-01, PLC-02) on dedicated VLANs while maintaining IT network connectivity through a single trunk. Network engineers can fork this diagram to customize VLAN assignments, add redundancy, or integrate additional industrial devices into converged IT-OT environments.