As the top and highest-throughput layer of a three-tier switch architecture, this high-performance backbone forwards data packets efficiently and virtually latency-free to connected aggregation switches resp. The hierarchy Ethernet network is a three-layer integrated setup of networking devices. The strategic design of a hierarchy network may comprise more than three layers. The Cisco Catalyst ™ 9500 Series, including the Catalyst 9500X models, continues to shape the future with continued innovation that helps you reimagine connections, reinforce security and redefine the experience for your hybrid workforce big and small. They perform a vital function in ensuring the network's reliability and stability because they are in charge of routing data across the network infrastructure in a reliable and timely manner. I'm thinking I would have to create the SVIs on the Core (VLANs with default gateway IP addresses), and I would have to configure the connecting interfaces from core to access stacks as trunk ports right? Given the VLANs are.