Chapter 7 - Chapter 7 Commerical Information Services Who...

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Chapter 7 Commerical Information Services Who are they 4 biggest are Prodigy, America OnLine (AOL), compuserve, and Microsoft network What are they They are like a very large host computer supporting very large data base of information with the capability to accomodate many terminals connected through telephone lines and modems. What services do they provide Travel information, access to on-line airline travel reservations, on-line magazines that you can browse, electronic shopping malls, stock quotes, online technical support for software and hardware, chat rooms for on-line conversations with other service users on a particular subject or celebrities, electronic mail capability, and internet access. Some of these capabilities are provided exclusively by the information service and some are available to all through the Internet. Why use an information service Relatively easy, inexpensive way to gain access to information and the internet if not supplied for free by your school. Most services provide easy to use menus and user interfaces, to help you get the information you desire. How much do they cost Basic user fee of $10 or so per month. Extra fees for premium services and for connect time beyond the time alloted in the basic fee. How to subscribe Get a startup kit - may be mailed to you or in a magazine. Comes with a disk that has communications software for the service and a temporary id and password. Install the communciations software on your computer, select a local access number from the ones provided by your software, and dial up and connect to the information service's computer using your modem. What is the Internet? It started in the 1960s as a project of the Advanced Research Project Agency (ARPA). It was originally known as ARPANET. The goal was to create a secure network of computers that could withstand a nuclear attack. The network should be able to function even if one or more computers was knocked out of
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service. This would allow personnel at one site to use a computer at another site if their computer was unavailable. It began with 4 computer networks in the US in 1969. Today the internet is a network of over 2 million computer networks worldwide. Each network is called a site. Major sites are connected together by special high speed communicatons links called the internet backbone. Each major site provides access to the internet to the computers in its own local area network. A major site will also be connected to several other sites (computer networks) in its geographical area and provide internet access to these other sites. For example, in the Philadelphia area UPenn is a major site. It provides internet service to the network of campus computers wired into it (faculty offices, labs, dormitory rooms) and connected by telephone lines (in faculty and student homes). As a major site, UPenn has links to computer networks at all the other colleges in the Philadelphia area. They are connected to the internet backbone through UPenn. A message from a Temple student's home computer travels over phone lines to
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Chapter 7 - Chapter 7 Commerical Information Services Who...

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