Abstract
Virtual local area networks (VLANs) represent the logical separation of physical LANs. A VLAN allows splitting up physical network devices, such as Cisco's switches and access points into different virtual local area networks (LANs), in which each VLAN takes on its own unique characteristics. With the introduction of VLANs into a wireless network, one can define multiple compatible group policies, such as voice and data groups that allow using one access point for all of unique wireless client groups. VLANs can also be characterized and used to represent a group of devices on different physical LAN segments that can then communicate with each other as if they are on the same physical LAN. WLANs are widely used in the wired LAN industry since the 1990s. The VLANs proven support of scalability and cost savings are required by network administrators and architects in LAN network deployments. This chapter reviews the basic workings of the VLANs used on wired networks. It covers specific protocols and functions that make up a VLAN and its technology.
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