Campuses and schools where classrooms, labs, exam rooms and dormitory traffic are separated by VLAN and the backbone has to carry them all.

A security integrator needed to replace a mixed-brand camera network on a two-building campus without re-cabling. The design split the PoE load across 24-port L2 PoE switches per building, aggregated them over 2.5G, and sized the budget before ordering.
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Four buildings shared one flat network, so an exam room sat on the same broadcast domain as the canteen tills and the staff Wi-Fi. Building switches and floor PoE now give each group its own VLAN, with the exam room cut over by schedule.
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Three lab groups were sharing a gigabit link, and a dataset transfer that used to run overnight now finishes inside a working session. The building splits 10G for instruments from 2.5G for workstations and keeps each lab on its own VLAN.
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