Exam 7: Telecommunications, the Internet, and Wireless Technology

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What has made the Google search engine so successful?

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The Google search engine became so successful because it was one of the first search engines to incorporate page ranking.Not only does it index the web pages it finds according to both keywords and combinations of keywords,it also ranks each page according to the number of pages that link to it,and the number of pages it links to itself.This helped make search results more relevant when compared to search engines relying solely on key words used on web pages.A user could be relatively certain that they would find relevant information within the top results of a Google search.Improved search results for the user,along with continual improvements to its search engine,the development and other web applications,tools,and its Ad Sense product where it sells keywords to the highest bidder has made Google so successful as a search engine and marketing firm.

What are the two types of signals used to communicate a message in a network and how are they different? What device converts one type to the other type?

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The two ways to communicate a message in a network are analog signals and digital signals.An analog signal is represented by a continuous waveform that passes through a communications medium and is used for voice communication.Examples include the telephone handset and other types of speakers that generate analog sound.On the other hand,digital signals are binary waveforms (not continuous)that communicate information as strings of two discrete states: one bit or zero bits (often depicted as strings of zeroes and ones).Computers use these types of signals and use modems to convert digital signals to analog signals.

Which of the following is a device that sends packets of data through different networks assuring they go to the correct address?

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C

A computer network consists of at least two computers.

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Which of the following is not a characteristic of packet switching?

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TCP/IP was developed during the early 1970s to support efforts to help scientists transmit data among different types of computers over long distances.

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Which type of network treats all processors equally and allows peripheral devices to be shared without going to a separate server?

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NFC tags are always passive.

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What are the business advantages of using voice over IP (VoIP)technology?

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Digital rights activists believe differentiated pricing does not violate net neutrality principles.

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Digital subscriber lines:

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What are wireless sensor networks? How do they work and what are they used for?

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Client/server computing has largely replaced centralized mainframe computing.

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A network that covers entire geographical regions is most commonly referred to as a(n):

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Which of the following pulls content from websites and feeds it automatically to users' computers?

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Which type of network is used to connect digital devices within a city or metropolitan area?

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What are some of the common types of physical transmission media and what differentiates them from one another?

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Which signal types are represented by a continuous waveform?

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The most common web servers today are:

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Coaxial cable is similar to that used for cable television and consists of thickly insulated copper wire.

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