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运用MAC协议一种类型便是以太网，它被用于总线或星型拓扑结构。
One type of MAC is Ethernet, which is used by bus or star network topologies.
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有三种常见的拓扑结构：星型、总线型和环型。
Three common topologies are the star, bus, and ring.
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有三种常见的拓扑结构：星型、总线型和环型。
Three common topologies are the star, bus, and ring.
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