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中继器（REPEATER）中继器的功能限于物理层，它是一种“笨”设备（无软件），只是简单地把二进制位从一个网络传给另一个网络或者从网络的某一段传到另一段。利用中继器可以方便地使网络扩展，但这要受到网络本身覆盖范围的限制。在常见的以太网中，两个工作站之间的路径不允
REPEATER repeaters are limited to the physical layer. They are “stupid” devices (no software) that simply transfer bits from one network to another or from one segment of the network Another paragraph. Repeaters make it easy to scale networks, but this is limited by the reach of the network itself. In common Ethernet, the path between two workstations is not allowed