Challenged Networks is defined in RFC 7228 as a network that has serious trouble maintaining what an application would today expect of the end-to-end Internet Protocol model, e.g., by:

Challenged Networks are Constrained Networks in some sense, but not all Constrained Networks are Challenged Networks. There is no well-defined boundary between the two, though. Delay-Tolerant Networking (DTN) has been designed to cope with Challenged Networks RFC 4838.

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