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Virtual LAN

Overview#

Virtual LAN (VLAN) is any broadcast domain that is partitioned and isolated in a computer network at the Data-link Layer (OSI-Model layer 2) and is a IEEE 802.1Q Standard

LAN is the abbreviation for Local Area Network and in this context virtual refers to a physical object recreated and altered by additional logic.

Virtual LANs work by applying "tags" to network packets and handling these tags in networking systems – creating the appearance and functionality of network traffic that is physically on a single network but acts as if it is split between separate networks. This allows VLANs can keep network applications separate despite being connected to the same physical network, and without requiring multiple sets of cabling and networking devices to be deployed.

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