Enterprise three-tier network topology with dual H3C core switches, redundant aggregation layer, and segmented access layer across DMZ and internal office zones. Internet traffic flows through a Palo Alto firewall border security gateway protecting web servers on VLAN 20 and database servers on VLAN 30, while internal office PCs and wireless APs connect via L2 access switches across VLANs 100-130. The architecture implements core-aggregation-access design with redundant paths between H3C S6520 core switches and dual H3C L3 aggregation switches, ensuring no single point of failure. This topology demonstrates enterprise-grade network segmentation, DMZ isolation, and scalable VLAN management for organizations requiring strict security boundaries and high availability. Fork this diagram on Diagrams.so to customize VLAN assignments, add additional access switches, or integrate with OCI networking services.