The series: 1 OS β 2 Networking β 3 Security β 4 HTTPS walkthrough, with Go alongside.
You are here: step 2a, Networking: the map. β Previous: Operating Systems, Linux, and Containers. Next: Networking from Zero (TCP/IP) β
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Series Β· step 2a
The OSI Model, One Click at a Time
One real request, followed through all seven layers. You click "Place order" on a shopping site from your laptop on home Wi-Fi. About 250 ms later you see "Order confirmed".
Contents
21 chapters, one page each. Prefer one long page? Read the whole book on one page.
- How to read this guide1 min
- The series: OS β networking β security β HTTPS2 min
- Table of contents1 min
- Part 1 β The scenario2 min
- Part 2 β The mental model4 min
- Part 3 β Layer 1: Physical5 min
- Part 4 β Layer 2: Data Link6 min
- Part 5 β Layer 3: Network6 min
- Part 6 β Layer 4: Transport7 min
- Part 7 β Layer 5: Session5 min
- Part 8 β Layer 6: Presentation5 min
- Part 9 β Layer 7: Application6 min
- Part 10 β The full replay: a millisecond timeline2 min
- Part 11 β X-ray of one packet2 min
- Part 12 β Inside the server: from the NIC to your handler2 min
- Part 13 β The return trip and the goodbye1 min
- Part 14 β Debugging by layer: the incident playbook3 min
- Part 15 β Architecture decisions by layer: the senior and manager view3 min
- Part 16 β Cheat sheet2 min
- Part 17 β Self-check questions4 min
- Continue the series1 min
Generated from real-life-example-osi.md Β· 8 Oct 2026 16:36