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home network
A home network or home area network (HAN) is a type of local area network with the purpose to facilitate communication among digital devices present inside or within the close vicinity of a home. Devices capable of participating in this network, for example, smart devices such as network printers and handheld mobile computers, often gain enhanced emergent capabilities through their ability to interact. These additional capabilities can be used to increase the quality of life inside the home in a variety of ways, such as automation of repetitious tasks, increased personal productivity, enhanced home security, and easier access to entertainment.
==Origins==
One of the primary drivers behind the establishment of this kind of network is the need to distribute residential Internet access to all internet capable devices in the home. Due to the effect of IPv4 address exhaustion, most Internet service providers provide only one WAN-facing IP address for each residential subscription. Therefore, most homes require a device capable of network address translation (NAT) that can route packets between the public address visible to the WAN and private addresses of individual devices that share that public address. This router defines the boundary at which the service provider's network stops and the home's network begins. While it is possible for home networks to exist without connectivity to the outside world via a router, such topologies would have limited utility considering the bulk of current home network usage comes from home devices communicating with the WAN rather than with other home devices.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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