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首先说HUB,也便是集线器。它的作用可以简单的理解为将一些机器连接起来构成一个局域网。而交换机(又名交换式集线器)作用与集线器大体一样

(First of all, the HUB is the hub. Its role can be simply understood as connecting some machines to form a local area network. Switches (aka switching hubs) function in much the same way as hubs)

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