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With the emergence of cloud computing, new data center architectures are being created to address the challenges of the new computing models. The scale of these next-generation data center networks drives the demand for high-density, low-latency and low-power networking solutions. These networks are being deployed with flat topologies, virtualization and low latency. The silicon solutions that are being developed to address these new networks are redefining the data center landscape. This paper and the presentation describe the cloud data model and the evolution of the data center, and then consider the technologies that are being developed to address the new paradigms. This paper also describes the silicon solutions (the underlying engines) and the challenges they must overcome to meet these requirements.