Multi-building enterprise network with DMZ, four VLANs, and fiber backbone connecting two distribution switches across buildings. Traffic flows from Internet through Core Router and Firewall to DMZ servers, then to L3 Core Switch distributing to Building 1 (Office, Guest WiFi) and Building 2 (IT, Production) via fiber backbone. Each building uses L3 Distribution Switches and Cat6 Access Switches to segment departments by VLAN—Management, Finance, Marketing in Building 1; IT, Software Dev, Production, Quality Control in Building 2—with wireless APs for each VLAN. This architecture demonstrates defense-in-depth with perimeter security, network segmentation by function, and scalable access layer design for 100+ users across two sites. Fork this diagram on Diagrams.so to customize IP ranges, add additional VLANs, or adapt for your campus network topology.