In enterprise networking, the hierarchical three-tier model is divided into three distinct roles: access switches (which connect end-user devices to the network via Layer 2), distribution switches (which route inter-VLAN traffic and enforce security policies at Layer 3), and. In enterprise networking, the hierarchical three-tier model is divided into three distinct roles: access switches (which connect end-user devices to the network via Layer 2), distribution switches (which route inter-VLAN traffic and enforce security policies at Layer 3), and. The hierarchy Ethernet network is a three-layer integrated setup of networking devices. These networks are designed with three tiers that facilitate strategic installation, management, and maintenance, and so on. The strategic design of a hierarchy network may comprise more than three layers. Knowing the roles of core, aggregation, and access switches in contemporary network topology becomes essential to create effective and scalable networks. The main job of a core network switch is to move large amounts of data quickly. It collects data from all other switches, so it needs to be very fast and have. A Cisco core switch is a high-capacity switch that serves as the gateway to a wide area network (WAN).