It's much larger but fundamentally it's not that different. In each rack you have one or two switches. How do you connect those racks to each other? The standar

It's much larger but fundamentally it's not that different. In each rack you have one or two switches. How do you connect those racks to each other? The standard answer (simplified) is centralized spine switches but AWS discovered that a random network where the rack switches connect directly to each other is cheaper.