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Virtual Switch: For network communication between virtual machines

    专用：本地虚拟机和虚拟机之间的通讯                在虚拟机的虚拟网卡中可以选择虚拟交换机的连接    外部：用于虚拟机和外部网络进行通讯                绑定物理网卡                物理机和虚拟机同时使用该网卡&虚拟机单独使用

Virtual network card
Dependent on the virtual machine, you can select a connected virtual switch when multiple network cards are connected to multiple networks
Multiple networks: Multiple virtual switches
Multiple networks: Multiple VLANs
Multiple NICs connect to the same switch, using VLAN ID to differentiate

                                        两台虚拟机通讯时，两台虚拟机连接同一个虚拟交换机，必须相同的VLAN ID才可以通讯

Start from scratch-build your own virtual Lab-3