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Wireless local area networks
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A local area network (LAN) is a group of computers linked together within a building, campus, or other small region. The interconnections in early LANs were made with wire cables, but increasingly, radio links are being used. A wireless LAN offers flexibility because the computer users can move around without having to bother with plugging and unplugging cables. This arrangement is ideal when notebook computers (also known as laptops) are used. The way in which a LAN is arranged is called the LAN topology. There are two major topologies: the client-server wireless LAN and the peer-to-peer wireless LAN. In a client-server wireless LAN (Fig. 32-6), there is one large, powerful, central computer called a file server, to which all the smaller personal computers (labeled PC) are linked. The file server has enormous computing power, high speed, and large storage capacity, and can contain all the data for every user. End users do not communicate directly. All the data must pass through the file server. In a peer-to-peer LAN (Fig. 32-7), all of the computers in the network are PCs with more or less equal computing power, speed, and storage capacity. Each user generally maintains his or her own data. Subscribers can, and almost always do, communicate
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32-6 A client-server wireless LAN.
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32-7 A peer-to-peer wireless LAN.
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directly without the data having to pass through any intermediary. This offers greater privacy and individuality than the client-server topology, but it is slower when a large number of users need to share data. In the illustrations, only three PCs are shown in the networks. But any LAN can have as few as two, or as many as several dozen, PC workstations. Client-server LANs are favored by large institutions. Small businesses and schools, or departments within a larger corporation or university, prefer to use peer-to-peer LANs, mainly because they are cheaper and easier to maintain.
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Wireless technology lends itself to certain security applications, especially those involving mobile vehicles such as cars, boats, and trucks. Also, a wireless link can alert you to a fire or intrusion at your home or business, when you are not physically present at the location. One well-known wireless security system for cars employs a device that transmits a radio signal when the vehicle is being improperly operated. The system circuits and antenna are concealed, although there might be a warning sticker on the
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Hobby radio 617 car. If a potential thief knows your vehicle has a wireless security system, he or she will probably not want to spend a lot of time snooping around to find and disable the system. If someone manages to steal your car and it has a wireless security system installed, and if you re lucky enough to find out about the theft within a short time, tell the police about the security system. The police have a wireless transmitter that sends out a signal that contains the vehicle identification number (VIN) for your car. This signal is received by the equipment in your car, which starts up its own transmitter. Using radiolocation equipment, the police can pinpoint the position of your car on a map. From there, mobile direction-finding radio receivers can be used to reach the car. In some cases the police have caught thieves while they were actually driving stolen cars. A home or business wireless security system operates like a paging device or beeper. If something happens that triggers the security system, a radio signal is transmitted that sets off a small radio receiver you carry. Such a system will ideally telephone the police and/or fire department as well. If you happen to be reasonably near your home or business, you can drive to the site.
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