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Alright, let's talk about Trusted Network Detection, or TND for short. If you've been living in the Cisco Secure Access world for any amount of time and have deployed the Zero Trust Access (ZTA) client, you've probably stumbled across this setting and asked yourself one of two questions: "what on earth does this do?" or the more dangerous "I don't know...

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...