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What are the main components of a modern data center network?

What are the main components of a modern data center network?
The main components are top-of-rack switches that connect servers in each rack, leaf switches that aggregate top-of-rack connections, spine switches that interconnect leaves at high speed, and edge devices that connect to external networks. Modern designs use leaf-spine topology because it provides predictable performance and scales horizontally. Each layer has its own role in the overall architecture.

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