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08

NetLab

TypeScript
React Flow
Zustand

Drag PCs, switches, routers, hubs and firewalls onto a canvas, wire them together and send a packet through. The protocol is modelled rather than mimicked: TTL drops only at Layer 3, switches learn MAC addresses from the traffic passing them, firewall rules deny by ACL, and an unroutable packet fails with the exact reason. Every device has its own Cisco-style console with ping, traceroute and show commands, and nine preset topologies load a working network in a click.