VLANs can create network segmentation can be made easily for management reasons or for security reasons. VLANs also enable high-density LAN switches are built using the same hardware. Some switches can also interconnect transparently inter-VLAN using VLAN trunking protocol.
In the simple diagram above, the local area network in the segmentation using a switch that supports VLANs. In our previous scenario, local area network at the department of Geology, Accounting and Workshop segmented using VLANs.
Types of VLAN
There are only two types of VLAN possible today, cell-based VLANs and frame-based VLANs.
Cell-based VLANs are used in ATM switched networks with LAN Emulation (or LANE). LANE is used to allow hosts on legacy LAN segments to communicate using ATM networks without having to use special hardware or software modification.
Frame-based VLANs are used in Ethernet networks with frame tagging. The two primary types of frame tagging are IEEE 802.10 and ISL (Inter Switch Link is a Cisco proprietary frame-tagging). Keep in mind that the 802.10 standard makes it possible to deploy VLANs with 802.3 (Ethernet), 802.5 (Token-Ring), and FDDI, but Ethernet is most common.
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