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Once you ve established a connection between the PC and the ISP, you can do nothing on the Internet without applications designed to use one or more TCP/IP services, such as Web browsing and e-mail TCP/IP has the following commonly used services:
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Each of these services (sometimes referred to by the overused term TCP/IP protocols) requires a special application, and each of those applications has special settings You ll look at all five services and learn how to configure them
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The Web provides a graphical face for the Internet Servers running specialized software called Web servers provide Web sites and Web pages that you can access and thus get more or less useful information Using Web-browser software, such as Internet Explorer or Mozilla Firefox, you can click a link on a Web page and be instantly transported, not just to some Web server in your home town, but anywhere in the world Figure 1727 shows Internet Explorer at the home page of my company s Web site, wwwtotalsemcom Where is the server located Does it matter It could be in a closet in my office or on a huge clustered server in Canada The great part about the Web is that you can get from here to there and access the information you need with a click or two of the mouse Although the Web is the most popular part of the Internet, setting up a Web browser takes almost no effort As long as the Internet connection is working, Web browsers work automatically This is not to say you can t
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Figure 1727
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Tech Tip
Ping
The command-line tool ping may be your best friend for diagnosing TCP/IP errors Ping always works; you don t need to log on to a server or even log on to a system Simply type in a DNS name or an IP address To run ping, get to a command prompt (Start | Run | type CMD | click OK) and type ping followed by a DNS name or IP address, like this:
c:\>ping wwwwhitehousegov
make plenty of custom settings, but the default browser settings work almost every time If you type in a Web address, such as the best search engine on the planet wwwgooglecom and it doesn t work, check the line and your network settings and you ll figure out where the problem is
Configuring the Browser
Web browsers are highly configurable On most Web browsers, you can set the default font size, whether it will display graphics, and several other settings Although all Web browsers support these settings, where you go to make these changes varies dramatically If you are using the popular Internet Explorer that comes with Windows, configuration tools are found in the Internet Options Control Panel applet or under the Tools menu Proxy Server Many corporations use a proxy server to filter employee Internet access, and when you re on their corporate network you will have to set your proxy settings within the Web browser (and any other Internet software you want to use) A proxy server is software that enables multiple connections to the Internet to go through one protected PC, much like how ICS works on a home network Unlike ICS, which operates transparently to the client PCs by manipulating IP packets (we say that it operates at Layer 3 the Network layer in the OSI model see 16), proxy servers communicate directly with the browser application (operating at Layer 7, the Application layer) Applications that want to access Internet resources send requests to the proxy server instead of trying to access the Internet directly, both protecting the client PCs and enabling the network administrator to monitor and restrict Internet access Each application must therefore be configured to use the proxy server To configure proxy settings in Internet Explorer, choose Tools| Internet Options Select the Connections tab Then click the LAN Settings button to open the Local Area Network (LAN) Settings dialog box (Figure 1728) Note that you have three options here, with automatic detection of the proxy server being the default You can specify an IP address for a proxy server by clicking the third checkbox and simply typing it in (Figure 1729) Your network administrator or a CompTIA Network+ tech will give you information on proxy servers if you need it to configure a machine
Then press the ENTER key If the Web server is up, you ll get a reply to that effect You can even ping yourself: just type ping 127001 (127001 is known as the loopback address) This can give you a quick check to make sure your NIC is functional If you ping an address and get the famous Request timed out message, the device you are trying to ping is not available Be aware, however, that Request timed out messages are fairly common when you use ping on the Internet because many servers turn off the ping reply as a security measure
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