The successful use of wireless computing systems

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Unformatted text preview: ays operate at the top three layers of the OSI model (session, presentation, and application). They are the most sophisticated internetworking tools and are used for interconnecting dissimilar networks that use different communication protocols. That is, gateways are used to interconnect networks that are built on totally different communications architectures. For instance, a gateway may be used to interconnect two networks, one of which uses the IP suite and the other uses the SNA protocol suite. Since networks interconnected by a gateway use dissimilar protocols, protocol conversion is the major job performed by gateways. Additionally, gateways sometimes also perform routing functions. WIRELESSNETWORKS One of the most challenging and interesting recent trends in the computer and communications industries is the integration of wireless communications and computing. The resulting network is referred to as a wireless computing systems. A wireless computing system enhances the functionality of computing equipment by freeing communication from the location constraints of the wired computing systems. Types of Wireless Computing Systems Wireless computing systems can be broadly classified into the following two categories: 1. Fixed wireless systems. These wireless computing systems support little or no mobility of the computing equipment associated with the wireless network. For example, a LAN can be set up using wireless technology to get rid of the hassles of laying cables. The LAN will work as a conventional wired LAN except for the difference that it does not need any cabling to be carried out. 2. Mobile wireless systems. These wireless computing systems support mobility of the computing equipment, which the users use to access the resources associated with the wireless network. In turn, these systems support mobility of users and allow the mobile users to access information-from anywhere and at anytime. The resulting computing environment, which is often called mobile computing or nomadic computing, no. longer requires a user to maintain a fixed position in the network and enables almost unrestricted user mobility. Typical computing equipment...
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