Computers and the Internet Destination data in Software

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638 Computers and the Internet Destination data
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33-5 Internet data flows in packets from the source to the destination.
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cannot be completely reconstructed until all the packets have arrived and the destination computer has ensured that there are no errors.
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For many computer users, communication via Internet electronic mail (e-mail) and/or newsgroups has practically replaced the postal service. You can leave messages for, and receive them from, friends and relatives scattered throughout the world.
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The Internet 639 To effectively use e-mail or newsgroups, everyone must have an Internet address. These tend to be arcane. An example is sciencewriter@nanosecond.com The first part of the address, before the @ symbol, is the username. The word after the @ sign and before the period (or dot) represents the domain name. The threeletter abbreviation after the dot is the domain type. In this case, com stands for commercial. Nanosecond is a commercial provider. Other common domain types include net (network), org (organization), edu (educational institution), and gov (government). In recent years, country abbreviations have been increasingly used at the ends of Internet addresses, such as us for United States, de for Germany, uk for United Kingdom, and jp for Japan.
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Internet conversations
You can carry on a teletype-style conversation with other computer users via the Internet, but takes a bit of getting used to. When done among users within a single service provider, this is called chat. When done among people connected to different service providers, it is called Internet relay chat (IRC). Typing messages to and reading them from other people in real time is more personal than letter writing, because your addressees get their messages immediately. But it s less personal than talking on the telephone, especially at first, because you cannot hear, or make, vocal inflections. It is possible to digitize voice signals and transfer them via the Internet. This has given rise to hardware and software schemes that claim to provide virtually toll-free long-distance telephone communications. As of this writing, this is similar to amateur radio in terms of reliability and quality of connection. When Net traffic is light, such connections can be good. But when Net traffic is heavy, the quality is marginal to poor. Audio signals, like any other form of Internet data, are broken into packets. All, or nearly all, the packets must be received and reassembled before a good signal can be heard. This takes variable time, depending on the route each packet takes through the Net. If many of the packets arrive disproportionately late, and the destination computer can only do its best to reassemble the signal. In the worst case, the signal might not get through at all.
Getting information
One of the most important features of Internet is the fact that it can get you in touch with thousands of sources of information. Data is transferred among computers by means of a file transfer protocol (FTP) that allows the files on the hard drives of distant computers to become available exactly as if the data were stored on your own computer s hard drive, except the access time is slower. You can also store files on distant computers hard drives. When using FTP, you should be aware of the time at the remote location, and avoid, if possible, accessing files during the peak hours at the remote computer. Peak hours usually correspond to working hours, or approximately 8:00 a.m. to 5:00 p.m. local time, Monday through Friday.
640 Computers and the Internet You must take time differences into account if you re not in the same time zone as the remote computer. The World Wide Web (also called WWW or the Web) is one of the most powerful information servers you will find on-line. Its outstanding feature is hypertext, a scheme of cross-referencing. Certain words, phrases, and images make up so-called links. When you select a link in a Web page or Web site (a document containing text and graphics and sometimes also other types of files), your computer is transferred to another document dealing with the same or a related subject. This site will probably also contain numerous links. Before long, you might find yourself surfing the Web for hours going from site to site. The word surfing derives from the similarity of this activity to television channel surfing. The Web works fastest during the predawn hours in the United States, when the fewest number of people are connected to the Internet. When Net traffic is heavy, Web documents can take a long time to appear. In some instances you won t be able to get a page at all; you ll sit there staring at a blank display or at an hourglass. This problem is worst with comparatively slow telephone-line modems, but it can occur even with the most expensive, high-speed Internet connections. When you experience it, you ll know why some people refer to the Web as the World Wide Wait.
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