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Data center virtualization combines compute virtualization (VMs/containers) with network virtualization so workloads can move safely and consistently. Cisco Systems provides integrated compute and data center networking foundations (UCS + fabric capabilities) that pair with virtualization stacks for standardized operations and segmentation. VMware delivers the core VM platform and software-defined data center capabilities (compute, storage, and network virtualization) for flexible workload placement and policy control. Arista Networks supports virtualization-heavy environments with scalable leaf–spine fabrics, automation, and telemetry for high-performance east–west traffic. Extreme Networks focuses on simplified fabric operations and policy-based networking that can complement virtualized data centers with consistent connectivity and segmentation.