Chapter 1 — How Data Moves: the OSI model as a diagnostic tool, not a memory test                              Chapter 2 — Addressing & Subnets: IP, masks, and the CIDR table worth memorising                              Chapter 3 — DNS, DHCP & Services: the three that break most often                                          Chapter 4 — Devices & Topology: switches, routers, VLANs, cabling limits
Chapter 5 — Wi-Fi in Practice: channels, interference, and signal strength
Chapter 6 — Diagnostics Toolkit: every command, and how to read the output
FORMAT
Downloadable PDF, 15 pages. Chapter 6 is designed as a working reference.
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