chapter 3 - 1.What are the primary reasons for networking...

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1.What are the primary reasons for networking among computers and computer- related devices? Networks can be used for simple tasks like sharing a printer or they can be used for more advanced applicationslike linking complex point-of-sale systems and worldwide video conferencing.One of the main advantages fornetworking computers together either in close proximity or geographically separated is to share resources in acost effective way (i.e., hardware and software).The five main reasons for networking computers andcomputer-related devices is:- data sharing (could be locally through a LAN or globally through a WAN)- improved communications through email or videoconferencing- distributed data processing and client/server systems- sharing of technology resources (like NASA's Pleiades supercomputer used for modeling and simulation)- marketing outreach (think Amazon.com) 2.Explain the difference between analog and digital signals.Is the trend toward more use of (a) analogor (b) digital signals in the future? Both analog and digital signals are used to transmit information, usually through electric signals.In both thesetechnologies the information is transformed into electric signals in order to be transmitted. The differencebetween analog and digital technologies is that in analog information is translated into electric pulses of varyingamplitude while in digital technology, information is translated into binary bit format (zero or one) where eachbit is representative of two distinct amplitudes.While analog signal use will never be truly "dead", the versatility and clarity of digital signals has taken overwhere analog couldn't perform.While analog uses voltage (higher the voltage, clearer and farther thetransmission) that degrades when transmitted (i.e., noise), digital is transmitted as a series of ones and zeros thatdoesn’t degrade like analog and gives higher transmission speed, higher signal quality and lower error rate.Everything from over-the-air television signals to home telephone service is now digital because of the higherquality and less "line noise" digital offers over analog.
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