Standard VMware vSwitch Overview
A virtual switch (vSwitch) is a software-based implementation of a physical Layer 2 access switch that appears as a virtual construct. On a host server, it enables networking between VMs and the external LAN. It brings together VMNICs and vNICs, facilitating internal and external communications, thus allowing the following:
VM communications within and between ESX hosts
ESX Management (Service Console) communication
Port assigned to a VLAN
VMKernel for vMotion, iSCSI, Fault Tolerance
Port assigned to a VLAN
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