Answer first: access switches connect endpoints, the distribution or aggregation layer combines access blocks and often applies routing or policy, and the core provides resilient transport between distribution blocks; smaller sites can collapse core and distribution instead. Answer first: access switches connect endpoints, the distribution or aggregation layer combines access blocks and often applies routing or policy, and the core provides resilient transport between distribution blocks; smaller sites can collapse core and distribution instead. A network switch is a vital component of a computer network that connects multiple devices, like computers, printers, and servers, within a local area network (LAN). The primary transmission and routing of data signals take place at the core layer only. Here, we will core. A core switch is the backbone of a large-scale network, designed to handle massive volumes of traffic with ultra-low latency and maximum reliability. Sitting at the top of the hierarchical model, core switches interconnect distribution layer switches and provide high-speed data transfer across. A core switch is a high-capacity, high-performance Layer 3 switch positioned at the physical backbone of an enterprise network.