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2.2.1 Challenged Networks

2.2.1. Challenged Networks​

A constrained network is not necessarily a "challenged network" [FALL]:

Challenged Network: A network that has serious trouble maintaining what an application would today expect of the end-to-end IP model, e.g., by:

  • not being able to offer end-to-end IP connectivity at all,

  • exhibiting serious interruptions in end-to-end IP connectivity, or

  • exhibiting delay well beyond the Maximum Segment Lifetime (MSL) defined by TCP [RFC0793].

All 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 [RFC4838].

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