port switcing hub
... Port Mapped I/O（I/O映射端口） Port Switcing Hub（交换集线器端口） posted write-through（缓冲直写式） ...
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这些多端口网桥叫交换式集线器或以太网交换机。
These multiport bridges were called switching hubs or Ethernet switches.
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随着时间的推移，然而，集线器取而代之的是交换机，发送到每个端口的交通指示设备端口。
Over time, though, hubs were replaced by switches, which send to each port only the traffic directed to the device on that port.
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