Enterprise three-tier network topology integrating OCI connectivity with Palo Alto firewall security, H3C core switches in HA configuration, and multi-VLAN distribution across office, WiFi, and management zones. Traffic flows from ISP through Palo Alto FW-01 into DMZ servers, then to redundant H3C S6520 core switches with 10GE uplinks feeding dual distribution layer switches managing VLANs 10, 20, and 30. Access layer switches distribute gigabit connectivity to endpoints and wireless APs across four access points, ensuring segmentation and failover resilience. This architecture demonstrates enterprise-grade network segmentation, redundancy, and security best practices critical for mission-critical deployments. Fork and customize this diagram on Diagrams.so to match your VLAN assignments, switch models, or OCI network integration requirements.