Free quiz · Appendix B of Book 10 · Car dealerships

Score your dealership network diagram

Open your current drawing, the real one. Tick each question you can answer yes. Each yes is worth 5 points.

Partly means no. "Most of it has a zone table" is a no.
Verbal knowledge doesn't count. If the answer lives in your head and not on the page, it's a no.
Check, don't remember. Look at one real device or cable and compare.

This is the car dealerships scorecard from Book 10, Draw Secure Car Dealership Network Diagrams. Each book in the series has its own. Pick another industry.

Part 1. Pages and readers

1. Do you have separate pages for separate readers: at least an overview, a logical page (zones and VLANs) and a physical page (devices and cables)?CHAPTER 12. Could the dealer principal read the overview and say, in their own words, where customers' financial information lives and what stops working if the internet line or the DMS goes down?CHAPTER 23. Does every page carry a title block with the rooftop, the date and a revision, all filled in?CHAPTER 2, 134. Is there one legend for colors, line styles and symbols, and does every page actually follow it?CHAPTER 3, 4

Part 2. Zones and VLANs

5. Are F&I, sales, the back office, the card terminals, service, the shop, parts, guests, building and lot systems, and network management each drawn in a named zone (or is the decision to combine two of them written down)?CHAPTER 36. Does every VLAN and subnet appear in exactly one zone, with its ID and name?CHAPTER 47. Does every VLAN show its gateway, so a reader can tell which device routes between zones?CHAPTER 48. Is the firewall drawn where the zones meet, with every member of the pair, a table of its interfaces, and the tunnels that end on it (the DMS, other rooftops, remote access)?CHAPTER 3, 49. Is every device the dealership doesn't own (the manufacturer's router, the provider's modem, the key cabinet or camera installer's box) drawn, with its owner and its zone?CHAPTER 3, 6

Part 3. The physical rooftop

10. Does every drawn backbone link, including the run to the service building, carry the label printed on the real cable?CHAPTER 511. Do switch uplinks show their port-channel members, speed, media and the VLANs they carry?CHAPTER 512. Is everything in the main closet and the shop closet on the page (provider handoffs, the manufacturer's router, UPSs, the console server, the box on the shelf nobody mentions), with what each UPS powers?CHAPTER 613. Are the firewall pair, the switch stacks and both internet lines drawn member by member, with a page that says what people notice when each one fails, and what happens on the morning the hosted DMS goes dark?CHAPTER 714. Does every SSID appear with its VLAN, zone and security, and does the customer Wi-Fi say that clients can't see each other?CHAPTER 8

Part 4. Conversations and policy

15. Are flows drawn from the side that starts them to the side that answers, including credit pulls and lender portals, the DMS, the manufacturer's systems, the MSP and vendor remote sessions, with their conditions (VPN, MFA, per ticket, recorded)?CHAPTER 916. Are the important denials drawn on purpose: the shop, sales and guests to F&I, every other zone to the card terminals, the manufacturer's network to anything inside, everyone else to network management?CHAPTER 917. Is there a flow register with a default-deny row and a zone matrix with an answer in every cell, and has it been compared to the firewall's actual rules in the last twelve months?CHAPTER 10, 16

Part 5. Keeping it true

18. Do the typed facts (IPs, serials, VLAN tables) come from one source of record, such as NetBox, instead of being typed into the drawing by hand?CHAPTER 1219. Has the drawing been checked against the real rooftop in the last 90 days, with the differences and unknowns kept in a dated gaps list?CHAPTER 13, 1520. Could you send an insurer, a pen tester or a buyer's due diligence team a version with management IPs, serials and circuit IDs removed, within ten minutes?CHAPTER 14

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Network Diagrams by Industry · Book 10

Draw Secure Car Dealership Network Diagrams: From Showroom to FTC Safeguards Rule

Every question names the chapter that fixes it, so every low score is a reading list.

The rest of the book: F&I and the credit file, the DMS outside your walls, shop diagnostic tools, lounge and lot Wi-Fi, and more rooftops, drawn for the FTC Safeguards Rule. One-time payment, 14-day refund.

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Scorecards for other industries

Every book ends with a 20-question scorecard written for its own networks. Take any of them free.

Free quiz · Book 1, Appendix B

0/100

Score your dealership network diagram

Part 1. Pages and readers

Part 2. Zones and VLANs

Part 3. The physical rooftop

Part 4. Conversations and policy

Part 5. Keeping it true

Tick the questions above

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