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Wednesday, August 10, 2011


The VLAN stands for virtual LAN (Local Area Network), VLAN basically a logical networks within already existing physical network. VLAN creates the logical segment of a LAN into different broadcast domains and this broadcast domain can send or received data from any computer located within that network.
There are many types of VLAN.
VLAN can be based on
  • ports type
  • protocol type
  • MAC address
  • and IP subnet address.
There are many reasons to use VLAN over traditional LAN.
Performance: VLAN used to reduce the need to send the traffic to unnecessary destination in a network.
Security: VLAN decreases the chances that people will gain access to data the are not authorized to see it.
Control Traffic Flow: VLAN does not broadcast traffic to nodes that are not part of that VLAN.