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Cell phones connect to local antenna that relays calls from one area to the next. oBluetooth: uses short wavelength radio transmissions to connectdevices (same as infrared technology- close proximity)Wireless mice, keyboards, or headphones. oWi-Fi: Name owned by the Wi-Fi Alliance.Became standard terminology to refer to a wireless network that you can access w/ one of you wireless devices such as laptops of PDAsUse radio technologyA Wi-Fi network consists of wireless access points (WAP or Hotspots) that is itself connected to a wired network. WAP transmits the transmissions it receives from wireless devices to a wired device connected to the internetBroadband Networks: refers to speed, frequency, and bandwidth of the networkoBaseband or BroadbandToday, more likely to be broadband networks.Faster download speeds (>256 Kbits/second)DSL (digital subscriber lines), and Integrated Service Digital Network (ISDN), and T-lines.
Network Coverage: Networks can be classified as a function of the area of coverage or geography of the network. oLocal Area Network: connect devices in a limited geographical area (local area usually of less than 5 kilometers)Homes, departments, schools, floor of office buildingOffer very good transmission speeds especially when wired. A cable must connect the NIC of the computer or device with the router/bridge/switch of the LANEthernet is most popular. oWide area networks: connect devices over a large geographic area (can span any distance you can imagine)City wide, continent wide, world wideMake use of various communication media (phone lines, coaxial cables and satellite) as well as several different providers (phone and cable companies)The Internet: publicly accessible worldwide network of networks.oThink of a road systemoMain connections, called Internet backbones, carry the bulk ofthe data traffic on the Internet. Networks from major ISPs makeup the backbone. These networks extend across the globe like interstate highway systemsoTo allow global traffic, routers are used to interconnect the various networks together. oEvery host/computer that is a full participant (permanently connected) on the Internet has a unique address called an IP (Internet Protocol) Address.IPv4 is now outdated (126.96.36.199) it’s run out of addresses to allocate INAN assigned last IPv4 February 3, 2011IPv6 from 4 sections to 16. oInternet began as a project by the US Defense Advanced Research Projects Agency (DARPA) in collab w/ universitiesGrew by absorbing various networks worldwide