In three decades we went from shared 10 Mb hubs and beige pizza-box routers to leaf-spine fabrics pushing 400 GbE (and beyond), software-defined overlays, and AI-optimized data centers with liquid cooling and smart NICs. The big shifts: switches replaced hubs, virtualization and cloud changed traffic patterns, leaf-spine killed big L2 domains, EVPN-VXLAN became the standard overlay, copper gave...
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