This article describes the various VLAN tagging methods used with ESXi/ESX. Virtual LAN (VLAN) implementation is recommended in ESXi/ESX networking environments because: It integrates ESXi/ESX into a pre-existing networkIt secures network trafficIt reduces network traffic congestioniSCSI traffic requires an isolated network VMware vCenter Server 5.5.x VMware ESX 4.0.x VMware vCenter Server 4.0.x V