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Each access layer in the data center is "Divided" in pods (building blocks), where servers in each pod share similar characteristics, whether these characteristics are similar hardware, similar SLAs provided to the customer (internal or external), and so on. This is different from building separate silos for each business unit. In a pod design, multiple business units may share the same pod, and run on similar server platforms because of the similar level of service required. A data center pod is constituted by a certain number of racks of servers that are all dependent on the same set of access switch hardware. Switch cabinets may either include top-of-rack switch with a fabric extender or a modular middle-of-the-row switch.
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