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Because you don't have a "network interface card", you have an ARM cpu, maybe even a whole-ass ARM SOC, handling ethernet frames on one side and talking PCI on the other.
You don't even have SD cards, because "memory cards" don't exist. That terabyte of storage the size of your thumbnail you bought? That's an ARM CPU managing the wear levels on its crap-ass flash backing storage while pretending to be a hard drive on the other side.
You don't know how many computers are in your computer.