(The hub (HUB) is the smallest unit that manages the network collectively. Like the trunk of the tree, it is the gathering point of each branch. HUB is a shared device, and its essence is a repeater, and the main function of the repeater is to regenerate and expand the received signal to extend the transmission distance of the network. It is precisely because the HUB is only a device for signal expansion and transfer, so it does not have the ability to automatically address, that is, it does not have an exchange function.)
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