A Layer 2 switch is a network device that forwards traffic based on MAC (Media Access Control) addresses. There are different types of enterprise switches that perform various roles in these layer-based or hierarchical ethernet networks. The hierarchy Ethernet network. When planning an enterprise access network, one of the most common dilemmas is whether to deploy Layer 2 (L2) or Layer 3 (L3) switches. The access layer plays a critical role in connecting end devices—such as computers, printers, IP phones, and wireless access points—to the rest of the enterprise. This guide provides a comprehensive comparison of Access, Distribution, and Core switches, detailing their functions, characteristics, and deployment scenarios. It is important to understand that each protocol implements its lower layers differently. Ethernet follows IEEE 802 and allows for variable-sized data, while protocols like ATM (Asynchronous Transfer Mode) have fixed 53 bytes of. Each layer has a specific job, and together they make data transmission possible: Layer 1 (Physical): This is all about wires, ports, and electrical signals—pure hardware. Layer 3. The Cisco three-layer hierarchical model provides recommendations for designing campus LANs.