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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.
A packet is a block of data with length that can vary between successive packets, ranging from 7 to 65,542 bytes, including the packet header. 1  Packetized data is transmitted via frames, which are fixed-length data blocks. 2  The size of a frame, including frame header and control information, can range up to 2048 bytes.he routing of network packets requires two network addresses, the source address of the sending host, and the destination address of the receiving host.