As the switch fully booted, a hidden partition mounted—one Mira had never seen. Inside was a single text file: flightlog.txt . She opened it. It wasn't switch logs.

Mira was a network engineer for a small regional airline, SkyLark. Her world was VLANs, spanning-tree protocols, and the quiet hum of server racks. SkyLark’s backbone ran on a pair of Catalyst 3750 switches, ancient by tech standards but as reliable as gravity. They had run for eleven years without a single critical failure. That was, until the Tuesday before Christmas.

She typed: boot flash:c3750-ipservicesk9-mz.122-55.se12.bin

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