Classifications of networks can be summed up in saying they corollate with how large of an area you want to cover. For example, LAN or Local Area Network. Which could be considered a house, smaller building, and usually only consists of a few PC’s or other devices. WAN or Wide Area Networks are essentially linking together LAN’s over a vastly larger area. The classification system is key to providing enough service and not wasting time/resources on areas that do not need to be larger than they are. It also keeps things more efficient. If I know the size and scale of what I am working on, it could lead to more progress or proper resource allocation for specific tasks.