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Extra resources for Cisco - GSR Product Update 1202

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Infrared Infrared−based systems are the simplest and least expensive wireless LANs. These systems work best when operated in the line of sight (that is, the transceivers involved in communication must face one another without any physical obstruction). Infrared systems are not bandwidth constrained—in other words, the signal does not spread, so devices using infrared can use the entire bandwidth of infrared when communicating with one another without any interference with any other device. They also can attain high speeds at relatively low costs compared to other competing types of systems.

Summary In this chapter we briefly described the history of wireless networks. We saw that wireless networks have been in use since the 1950s. We first examined the basic operation of a simple wireless network where we saw how two computers can be connected with each other to form a simple wireless LAN. Then we examined in detail the architecture of a generic wireless LAN. We saw that most wireless LANs operate in the Industrial, Scientific, and Medical (ISM) band; and that in the United States the FCC mandates that such devices must use a spread spectrum technology.

Internet Naming and Domain Name Servers It can be extremely difficult to remember all the numerical host IP addresses with which you might want to communicate. Instead, TCP/IP supports host naming, which allows an Internet name to be associated with an IP address; these names are called host names or the domain host names. com is the domain host name of this book's publisher, John Wiley and Sons—the name corresponds to the numerical address, and both are stored in databases called domain name servers.

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