Problem
Explain the difference between a failed network path and an unavailable local service.
System & architecture
Scenario state → Topology graph → Reachability evaluation → Operator view
Data flow
A deterministic scenario changes available links and nodes. The interface renders active routes, disconnected components and local-service state.
Technologies
TypeScript, React, SVG; no external telemetry.
Engineering constraints
Synthetic topology only. It does not model RF propagation, transport protocols or real mission performance.
Testing
Scenario-state unit tests and browser interaction checks exercise degradation, recovery and keyboard control.
Results & status
A public interactive explanation of partial operation, including a text-equivalent status and reduced-motion behavior.