和集线器一样，网络交换机的以太网实现是最常见的。
As with hubs, Ethernet implementations of network switches are the most common.
集线器和交换机有同一个局限，即以太网网络必须是无路由循环的。
One limitation that applies to hubs and switches alike is that an Ethernet network must be loop-free.
一个ARP请求被发送到所有虚拟以太网，从而更新网络上所有外部交换机和系统上的ARP缓存。
A gratuitous ARP request is sent on all virtual Ethernet adapters to update the ARP caches on all external switches and systems on the network.
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