45A method preventing users outside the network from accessing and/or damaging files or computers onthe network.GatewayA central device that manages the data traffic of the network, as well as data traffic to and from theInternet.IP (Internet Protocol) AddressA series of four numbers separated by periods identifying a unique Internet computer host.ISP Gateway AddressAn IP address for the Internet router. This address is only required when using a cable or DSL modem.ISP (Internet Service Provider)A business that allows individuals or businesses to connect to the Internet.LAN (Local Area Network)A group of computers and devices connected together in a relatively small area (such as a house or anoffice). A home network is considered a LAN.MAC (Media Access Control) AddressThe unique hardware address of a device connected to a network.NAT (Network Address Translation)A method allowing all of the computers on a home network to use one IP address, enabling access to theInternet from any computer on the home network without having to purchase more IP addresses from theISP.PC CardAn adapter that inserts in the PCMCIA slot of a computer, enabling the communication with a device.113 Appendix e GlossaryPPPoE (Point-To-Point Protocol over Ethernet)/PPPoA (Point-To-Point Protocol over ATM)Methods of secure data transmission.RouterA central device that manages the data traffic of the network.Subnet MaskA set of four numbers configured like an IP address used to create IP address numbers used only within aparticular network.SSIDSee “ESSID.”TCP/IP (Transmission Control Protocol/Internet Protocol)The standard protocol for data transmission over the Internet.WAN (Wide Area Network)A network that connects computers located in separate areas, (i.e., different buildings, cities, countries).The Internet is a WAN.