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Assessments

Each module has a short check for understanding. These are designed to be quick and practical. Use them as self-checks or as review prompts.

Module 0

  • Explain the difference between icnd and icnctl.
  • Identify the config precedence order for ICN.

Module 1

  • Explain ownership and borrowing with a small Rust example.
  • Write a Rust function that returns a Result and uses ?.
  • Explain when to use Arc<Mutex<T>> vs RwLock<T>.

Module 2

  • Draw the ICN layer stack from memory.
  • Explain how trust and identity relate to ledger authorship.

Module 3

  • Trace the icnd startup path through Runtime and Supervisor.
  • Describe why the Supervisor owns long-lived handles.

Module 4

  • Explain the DID format used by ICN.
  • Describe how key rotation is represented in ICN.

Module 5

  • Explain the difference between transport and gossip in ICN.
  • Describe how topic subscriptions affect routing.

Module 6

  • Explain how a mutual credit entry is represented in the ledger.
  • Describe how contracts interact with ledger operations.

Module 7

  • Describe the gateway auth flow end-to-end.
  • List three common scopes and what they allow.

Module 8

  • Describe how the Pilot UI obtains data from the gateway.
  • Identify where token handling occurs in the UI.

Module 9

  • List three production hardening measures from ICN docs.
  • Explain how to validate config before startup.

Module 10

  • Describe the test strategy and when to run which tests.
  • Outline the PR checklist for contributors.

Module 11 (Advanced)

  • Explain the agreement lifecycle states and transitions.
  • Describe how bilateral clearing reduces settlement transactions.
  • List three types of inter-cooperative agreements and their purposes.

Module 12

  • Explain the difference between metrics, tracing, and logging in ICN.
  • Identify where metrics are registered and how they are named.
  • Describe how observability helps diagnose gossip or ledger issues.

Module 13

  • Explain ICN's three-layer security model.
  • Describe how signed envelopes and replay guards work together.
  • Explain how trust classes affect rate limiting or access control.

Module 14

  • Describe the governance lifecycle from proposal to activation.
  • Explain how CCL capabilities limit contract behavior.
  • Identify where governance decisions are enforced in the system.
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