A router is a device generally used for networking which is used for forwarding the data packets flanked by various computer networks thus creating an overlay inter connected network because a single router is linked with various data lines on different networks. In case of a data packet coming in line to another data packet, the router requires reading of address information to find the final destination. Then it combines with the information already stored in a router policy to direct the source on to the subsequent network on its path. In this way, data packet gets transmitted from router through networks creating an inter network to reach the destination point. The selection for the best path inside a network is termed as routing.

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