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Virtual Local Area Networks (VLANs) are heavily utilized in enterprise networks to group hosts with common requirements together as if they were on the same LAN although they may be in separate physical locations. The key benefit of VLANs is its flexibility to allow any logical LAN to be implemented on any physical infrastructure. As a result, enterprise network administrators often use VLANs to group users and use the resulting grouping to control access to resources. Even in small enterprise networks such as the one studies in this paper, there are more than 50 VLANs in use. Despite their popularity, there has been little systematic work studying deployed VLANs and more importantly, understanding the traffic flow patterns inside these VLANs.
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