Physical and logical diagrams, rack layouts, fiber routing and cable schedules, IP address plans, VLAN tables, firewall diagrams, wireless heat maps, and data center layouts — reading and maintaining the documentation set a real network runs on.
Every diagram type in an enterprise network's documentation set exists because it answers a question the others deliberately don't: a physical diagram answers what's literally plugged into what, a logical diagram answers how traffic actually flows by VLAN and routing relationship, and a rack elevation answers whether there's room and power for the next device. This module teaches each document type on its own terms — what it shows, what it deliberately leaves out, and the specific self-check questions that catch the most common real-world documentation mistakes.
The harder discipline this module closes with isn't creating accurate documentation once — it's catching drift before an outage exposes it. A VLAN table, an IP address plan, or a cable schedule that was accurate on day one and has quietly diverged from reality since is often more dangerous than no documentation at all, because it actively misleads whoever trusts it during a real incident.