These days, the interests in challenged networks are increasing and many researches are performed to seek a reliable end-to-end connectivity under harsh environments, which have a long propagation delay, high error rates, low data rate, and intermittent connectivity. Delay Tolerant Network was introduced to provide challenged networks with reliable transmission and interoperability with an overlay network concept. In this paper, we present comprehensive overview of Delay Tolerant Network and introduce a study case about the implementation of this network. This paper is designed to encourage the exploration of this field by giving basic concept and also motivate to investigate this area by presenting a study case at the end section.
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