Module 1.1Layers are responsibilities
Use models to isolate problems. Do not treat layers like folders on disk.
Prerequisites
- No previous technical background required
- Read the section explanation before using tools
Outcomes
- Explain layers are responsibilities in your own words and apply it to a realistic scenario.
- Use models to isolate problems. Do not treat layers like folders on disk.
- Check the assumption "The model is not the network" and explain what changes if it is false.
- Check the assumption "Evidence beats confidence" and explain what changes if it is false.
Practice
- Complete one guided exercise and explain your decision in plain language
- Use the recap only after reading the main section
Artefact and failure modes
- A short module note with one key definition and one practical example
- Chanting layers. Layer talk can hide uncertainty. The goal is a testable statement.
- Skipping order. If you skip steps, you misdiagnose. Follow the chain from names to transport to encryption to application.