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I use that first diagram for laying things out
I've actually laid out VERY large and complex network using that first ruler. It's a visual tool for designing complex variable length subnets, supernets, and summarized subnets. That especially comes in handy for router, switch, and firewall engineers. Using the AND function and the /24 subnets is the basic stuff. The MCSE certifications don?t go that far in to subnet layout and design like the Cisco certification exams.