VLAN (Virtual Local Area Network)
VLAN - (Virtual Local Area Network) is a feature provided by most LAN switches. VLANs provide logical segmentation between groups of switched ports. VLANs can be carried between LAN switches using 802.1q trunks. This allows geographically dispersed PCs, servers and other network resources to behave as if they were connected to a single, network segment - even though they may not be.
VLANs have several benefits: They are used to limit the size of broadcast domains, providing more effective LAN utilisation and protection against the effects of broadcast storms.
They can provide an opportunity to introduce security between LAN segments as inter-VLAN traffic must pass through an intermediate device such as a router or security appliance.
They also provide flexibility as devices can be relocated across a campus LAN and remain on the same subnet.
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