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Labs

Labs open inside the browser simulator. A lab includes a topology, a task, and checks that tell you whether your configuration changed the network in the expected way.

LabUse it for
First routerCLI basics and interface orientation
Ping and tracePacket path and reachability basics
Static routesRouting table basics
VLAN accessSwitching and access ports
BGP local-prefPolicy-based path selection

Documentation should not stop at explanation. If a page describes OSPF, BGP, MPLS, or ACLs, it should also link to a lab where you can try that feature immediately.