Enterprise Network Architecture Diagram - Cisco Layer 2 & Layer 3 Switching Design #2221526 (License: Personal Use)

This diagram illustrates a resilient, hierarchical enterprise LAN architecture with two Cisco 3620 routers linking to the PSTN cloud and dual Layer 3 switch backbones for redundancy. Each zone contains multiple Layer 3 distribution switches feeding Layer 2 access switches that connect IP phones and eMac workstations. Cross-zone interconnections ensure high availability and load balancing across the infrastructure.

Used in IT documentation, networking training materials, or vendor solution pages to demonstrate scalable, fault-tolerant campus network designs; targets network engineers, architects, and students seeking real-world Cisco deployment examples.