A core switch is a high-capacity, high-performance Layer 3 switch positioned at the physical backbone of an enterprise network. The core layer is the backbone of the network, responsible for high-speed data forwarding, and is usually the most critical part of the network. Redundancy and High. It contains three layers: core, distribution, and access. Distribution layer: This layer has a multi-layer switch to which every LAN switch is connected. This 2-tier architecture is not ideal because it has a single-point failure when a multi-layer switch. In any professional environment, switches are deployed in a three-layer model to ensure speed, scalability, and reliability.