how to create barcodes in excel 2016 Common TCP/IP Applications in Software

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Common TCP/IP Applications
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Finally! You now know enough about the Transport layer, port numbering, and sockets to get into some of the gritty details of common TCP/IP applications There s no pretty way to do this, so let s start with the big daddy of them all, the Web
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The World Wide Web
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Where would we be without the World Wide Web If you go up to a non-nerd and say Get on the Internet, most of them will automatically open a Web browser, because to them the Web is the Internet I think it s safe to assume you ve used the Web, firing up your Web browser to surf to one cool site after another, learning new things, clicking links, often ending up somewhere completely unexpected it s all fun! This section looks at the Web and the tools that make it function, specifically the protocols that enable communication over the Internet
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9: TCP/IP Applications
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Figure 9-14 My router s Web page
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The Web is composed of servers that store specially formatted documents using a language called Hypertext Markup Language (HTML) Figure 9-14 shows the Web page built into my router HTML has been around for a long time and as a result has gone through many versions Today many pages are being written in an updated HTML version called eXtensible HTML (XHTML), which is HTML with an XML syntax Figure 9-15 shows a small part of the XHTML code for the Web page shown in Figure 9-14 NOTE XML is a markup language similar to HTML, but it provides more flexibility in how the data is described while being much more strict in its syntax Web browsers are designed to request HTML pages from Web servers and then open them To access a Web page, you enter http:// plus the IP address of the Web server
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Figure 9-15
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When you type the address of a Web server, such as http://19216841, you tell the browser to go to 19216841 and ask for a Web page All Web servers have a default Web page that they open unless you enter something more complex like http://19216841/status NOTE Most Web browsers are pretty forgiving If you only type in 19216841, forgetting the http: part, they usually just add it for you
Granted, most people don t enter IP addresses into browsers, but rather enter text like wwwtotalsemcom or wwwgooglecom Memorizing text addresses is much easier than memorizing IP addresses Web site text addresses use a naming protocol called Dynamic Naming System (DNS), which you will learn about in the next chapter For now, just enter the IP address as shown
9: TCP/IP Applications
HTTP
The Hypertext Transfer Protocol (HTTP) is the underlying protocol used by the Web, and it runs by default on TCP port 80 When you enter http:// at the beginning of a Web server s IP address, you are identifying how messages are formatted and transmitted, requesting and responding to the transfer of HTML-formatted files HTTP defines what actions Web servers and browsers should take in response to various commands HTTP has a general weakness in its handling of Web pages: it relays commands executed by users without reference to any commands previously executed The problem with this is that Web designers continue to design more complex and truly interactive Web pages HTTP is pretty dumb when it comes to remembering what people have done on a Web site Luckily for Web designers everywhere, other technologies exist to help HTTP relay commands and thus support more-interactive, intelligent Web sites These technologies include JavaScript/AJAX, server-side scripting, Adobe Flash, and cookies
Publishing Web Pages
Once you ve designed and created an HTML document, you can share it with the rest of the world To do so, you find a Web server that will host the page You most certainly can install a Web server on a computer, acquire a legitimate IP address for that computer, and host the Web page yourself Self-hosting is a time-consuming and challenging project, though, so most people use other methods Most Internet service providers (ISPs) provide Web servers of their own, or you can find relatively inexpensive Web hosting service companies The price of Web hosting usually depends on the services and drive space offered You can typically find a good Web host for around $10 a month for simple Web sites One option that has been available for a while is free Web hosting Usually the services are not too bad, but you will run across a few limitations Nearly all free Web hosts will insist on the right to place ads on your Web page This is not as much of an issue if you are posting a basic blog or fan Web page, but if you do any sort of business with your Web site, this can be most annoying to your customers The worst sort of free Web host services place pop-up ads over your Web page Beyond annoying! Once you have uploaded your HTML pages to your Web host, the Web server takes over What s a Web server I m glad you asked!
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