!!! Overview
[{$pagename}] ([LLN])  The [ROLL] ([Routing Over Low-Power and Lossy]) terminology document [RFC 7102] defines [LLNs] as follows:\\
Low-Power and Lossy Network.  


Typically composed of many embedded [devices] with limited power, memory, and processing resources interconnected by a variety of links, such as [IEEE 802.15.4] or low-power [Wi-Fi].  There is a wide scope of application areas for LLNs, including industrial monitoring, building automation (heating, ventilation, and air conditioning (HVAC), lighting, access control, fire), [Smart Home], [Internet of Things] ([IoT]) health care, environmental monitoring, urban sensor networks, energy management, assets tracking, and refrigeration.

[RFC 7228] further says, [{$pagename}] often exhibit considerable loss at the [Physical Layer], with significant variability of the delivery rate, and some short-term unreliability, coupled with some medium-term stability that makes it worthwhile to both construct directed acyclic graphs that are medium-term stable for routing and do measurements on the edges such as Expected Transmission Count (ETX) [RFC 6551].  Not all LLNs comprise low-power nodes [RPL-DEPLOYMENT].

[{$pagename}]s typically are composed of [Constrained Nodes]; this leads to the design of operation modes such as the "non-storing mode" defined by [RPL] (the IPv6 Routing Protocol for Low-Power and Lossy Networks [RFC 6550]).  So, in the terminology of the present document, an LLN is a [Constrained Node] [Constrained Network] with certain network characteristics, which include constraints on the [network] as well.


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