A packet is a well-defined block of bytes, which consists of header, data, and trailer. In a layered network architecture, packets created at one level may be inserted into another header/trailer envelope at a lower level. A bundle of data. On the Internet, data is broken up into small chunks, called packets; each packet traverses the network independently. Packet sizes can vary from roughly 40 to 32,000 bytes, depending on network hardware and media, but packets are normally less than 1500 bytes long.
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