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packet switching. n. A method of data transmission in which data is broken into small blocks that are transmitted over different channels and are reassembled into their original order at their destination.
Circuit Switching 1  : Each packet routes individually. 2  Packets may route in different paths and sometimes may be out of order. 3  Each packet contains the complete addressing of their routed paths sometimes of sequence number of the packet. 4  The packets may arrive at the destination machine in an order different from the transmission order.