What function does a VLAN serve in networking?

A VLAN, or Virtual Local Area Network, operates at the datalink layer of the OSI model, which is the second layer. The primary function of a VLAN is to segment a physical network into multiple logical networks. This segmentation allows devices on the same physical network to be grouped together based on business needs or functions, even if they are not physically located in the same place.

By dividing the network at the datalink layer, VLANs enable improved management and efficiency by reducing broadcast domains. Each VLAN can be treated as a separate network, allowing for enhanced control over traffic flow and improved performance within the network. Additionally, this segmentation supports better organization of resources, enhances security, and helps to minimize broadcast traffic, all while maintaining physical infrastructure.

Understanding that VLANs function at the datalink layer is essential for effectively designing and managing network infrastructure, as it plays a critical role in how devices communicate and are isolated from each other within the broader network.