Download CCNA INTRO Exam Certification Guide by Wendell Odom PDF

By Wendell Odom

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Htm. Bob receives the file from Larry and displays the contents of the file in the web browser window. Taking a closer look, this example uses two TCP/IP application layer protocols. First, the request for the file and the actual transfer of the file are performed according to the Hypertext Transfer Protocol (HTTP). Many of you have probably noticed that most web sites’ URLs (Universal Resource Locators, the text that identifies a web server and a particular web page) begin with the letters “http,” to imply that HTTP will be used to transfer the web pages.

However, you will often use terms relating to OSI. Also, the INTRO exam covers the basics of OSI, so this chapter also covers OSI to prepare you for questions about it on the exam. The TCP/IP Protocol Architecture TCP/IP defines a large collection of protocols that allow computers to communicate. TCP/IP defines the details of each of these protocols inside document called Requests For Comments (RFCs). By implementing the required protocols defined in TCP/IP RFCs, a computer can be relatively confident that it can communicate with other computers that also implement TCP/IP.

And thankfully, using a web browser is easy—you start a web browser on your computer and select a web site by typing in the name of the web site, and the web page appears. What really happens to allow that web page to appear on your web browser? These next few sections take a high-level look at what happens behind the scene. Imagine that Bob opens his browser. His browser has been configured to automatically ask for web server Larry’s default web page, or home page. The general logic looks like that in Figure 2-1.

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