In no doubt, IoT is network oriented - even the name IoT naturally relates to the Internet network.
IoT networking is much different than typical, multilayered, stack-oriented TCP/IP or similar communication model, we know well while using our PC, MAC, server or Smartphone on the daily basis.
Indeed constrained IoT devices are usually unable to operate regular - full time on, ISO/OSI layered stack, because of constrained resources. In details it primary means, IoT devices are limited by the processor power, RAM and storage sizes and particularly because of limited power resources. IoT device is expected to be energy efficient, thus low powered, that in most cases excludes typical wireless connection standards like i.e. WiFi. On the other hand, IoT devices are expected to communicate over long distances - some couple or a dozen of kilometres - where wired infrastructure like Ethernet cables and related infrastructure is non-existent and most of the wired technologies, copper-based is out of range. Following chapters explain some most popular concepts about how to organize network communication between IoT devices and how to let them communicate with the Internet: including hardware, software and human-users.