Try this learning loop
State a prediction before changing the controls. Identify which assumption changes the result, reset and test a second case. These deliberately small models explain one mechanism at a time.
Interactive concept model
Network path debugger
Break and repair IPv4 routes, NAT paths and return traffic.
Predict it. Test it. Change one thing.
Local educational model. No account or cloud charges. Nothing is deployed to AWS.
Client→Internet route → NACL → Security group→WorkerReply is checked separately. Client/return address: 203.0.113.10; modeled port: 49152.
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