Access Layer Switches: Operating at the network's edge, access switches connect end-user devices like PCs, printers, IP phones, and wireless access points. They are characterized by high port density, cost-effectiveness, security features at the edge, and often PoE support. The term campus LAN refers to a LAN network that spans a single geographic location, such as a building or university campus. An enterprise network is a large network that may contain several campus networks spanning different. This guide serves as an introduction to Layer 1 switching, explaining in layman's terms the OSI model, the functionality of crosspoint switches, the concept of latency, clock and data recovery as well as programmable switches. It typically sits at the access layer, provides high port density, often delivers PoE, and forwards traffic. Layers 1 through 3 specifically are pivotal but often ignored as they can be convoluted. An important thing to understand is each protocol implements these layers in nuanced ways.
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