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Delay Tolerant Networks (DTN) is one emerging type of networks whose distinguishing characteristic is that communications between two nodes in a DTN take prolonged period of time because of lack of continuous connection. DTNs were initially designed to operate over extreme distances encountered in space communications or other extreme environments where the long latency in communications inevitably causes TCP connections in the network to break down. Examples of such networks are those operating in battlefield and arctic lake pollution monitoring environments. As the TCP communication breaks down in a DTN, a Bundle Protocol can be used to handle the underlying communication with the remote party using node-to-node custody transfers.
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