The Data Center Network (DCN) is essential for supporting high-performance workloads, including Artificial Intelligence (AI). This briefing will explore next-generation data center architectures, highlighting the advantages of using an underlay/overlay topology and controller-based management. As DCN architectures become more complex, day-two operations software becomes increasingly necessary. This session will provide an overview of DCN hardware, architectures, and day-two operations, along with a brief introduction to the most commonly seen DCN OEMs in enterprise data centers.