21 what is a fax modem how is it more useful than a

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Unformatted text preview: ication from the location constraints of the wired computing systems. 23. Wireless computing systems are of two types -fixed wireless systems that support little or no mobility of the computing equipment associated with the wireless network and mobile wireless systems that support mobility of the computing equipment which the users use to access the resources associated with the wireless network. 24. Wireless communication technologies used in wireless networks include analog cellular, digital cellular, Cellular Digital Packet Data (CDPD), mobile radio networks, Personal Communication Services (PCS), satellite, microwave systems, and Local Multipoint Distribution Systems (LMDS). 25. The commonly used wireless technologies include 2G and 3G technologies, wireless LANs, Wireless Local Loops (WLLs), radio-router technology, multihop wireless networks, and Wireless Application Protocol (WAP). 26. A distributed computing system is a configuration in which many independent computer systems (which may be geographically far apart) are connected by a communication network, and in which messages, processing task, programs, data, and other resources are transmitted between cooperating computer systems. Such an arrangement enables the sharing of many hardware and software resources as well as information among several users who may be sitting far away from each other. Questions 1. What is a computer network? How is it useful? 2. Identify the basic elements of a communication system and the purpose of each. 3. Differentiate between simplex, half-duplex, and full-duplex modes of data transmission. 4. Which mode of data transmission is suitable for communication between a terminal and a computer? 5. "A full-duplex line is faster since it avoids the delay that occurs in a halfduplex circuit." Explain this statement. 6. Explain the terms "bandwidth" and "baud". 7. Why are the transmission mode and the bandwidth of communication channels of concern to an analyst designing a d...
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This document was uploaded on 04/07/2014.

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