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Bridges connect two similar networks and manage the flow of network data. It works on a data chain layer that not only expands the distance or scope of the network, but also enhances its performance, reliability and safety. Network 1 and network 2 are connected through the bridge to receive the data packages sent by network 1 to check the address in the package, and if the address belongs to network 1, it abandons it. On the contrary, if the address is a network 2, it continues to send to network 2 so that it can use the bridge to isolate information, divide the same network number into multiple sections (which belong to the same network number), isolate the safety segment and prevent illegal access by users in other sections. Because of the network segment, each segment is relatively independent (belonging to the same network number), failure of one segment will not affect the operation of the other。