Switch (aka) switching concentrator it is a network equipment used for electric (optical) signals forwarding, which can provide exclusive electrical signal path for any two network nodes connected to the switch.Switches can be thought of as connecting machines to form a local area network.However, there is a significant difference between routers and switches. Its role lies in connecting different network segments and finding the most suitable path for data transmission in the network. It can be said that in general, individual users have little demand.The router is generated after the switch to connect various devices in the network. It will automatically select and set the route according to the situation of the channel, and send the signals in the best order.The router has some connection with the switch and is not completely independent of the two devices. The router mainly overcomes the deficiency that the switch cannot route and forward packets.

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