(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 (also called switching hubs) function in much the same way as hubs. But there is a difference in function between the two: the hub adopts the office mode of sharing bandwidth, while the switch is the exclusive bandwidth. In this way, when there are many machines or a large amount of data, there will be a clear contrast between the two. The router and the above two)
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