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Baby Care A SAN typically has its own network of storage devices that are generally not accessible through the local area network by other devices. The cost and complexity of SANs dropped in the early 2000s to levels allowing wider adoption across both enterprise and small to medium-sized business environments. Most modern computer networks use protocols based on packet-mode transmission. A network packet is a formatted unit of data carried by a packet-switched network. The physical link technologies of packet network typically limit the size of packets to a certain maximum transmission unit . A longer message is fragmented before it is transferred and once the packets arrive , they are reassembled to construct the original message. Conversely, when the waters were low, the land dried up, killing crops. The oldest method of irrigation made use of man-made underground streams, called qanats, and is still being used in parts of the Middle East. Various groups of people began digging a