(Switches and hubs are very similar in appearance, and how do we distinguish the difference between them? A switch is a device that works at the second layer, the data link layer, and forwards data frames based on MAC addresses. A hub (HUB) is a device that works at the physical layer, and it does not provide the function of data exchange. It is equivalent to a cable, connecting various network nodes, and the switch can be used for any)
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