Modern data center networks are essential for handling today's data demands, combining advanced architectures such as spine-and-leaf topology, automation, and cutting-edge technologies like AI/ML and 400G connectivity. They address challenges such as scalability, security, and efficiency while enabling businesses to adapt to future trends like edge-to-cloud models and sustainable networking. Comprehensive observability is key to optimizing these networks, ensuring performance, reliability, and compliance. Modern data center networks are designed to integrate high-performance hardware with intelligent software solutions, serving as the backbone for applications, data storage, and business processes. The evolution of data center networks reflects the ongoing shift from hardware-reliant setups to agile, scalable, and intelligent infrastructures designed for modern demands.