Failure models
On This Lesson 4 topics
This lesson is planned. The outline below lists the topics it will cover. The full lesson has not been published yet.
In this lesson
name the three models at a conceptual level.
Planned topics
- Crash: a node stops and stays stopped (the simplest model).
- Omission: a node or link drops some messages or fails to send or respond.
- Byzantine: a node behaves arbitrarily or maliciously, sending wrong data.
- Most business systems assume crash and omission failures, and rely on security controls against byzantine behaviour.
- Byzantine tolerance matters for blockchains and some safety-critical systems.
Draft outline details
Demonstration
a three-row table: model, example, typical defence.
Check your understanding
Which model covers dropped messages?
Show answer
Omission.
Practice
Apply this lesson with the module's lab, exercises and quiz.
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