Ccna routing and Switching Complete Study Guide

Hypertext Transfer Protocol (HTTP)

All those snappy websites comprising a mélange of graphics, text, links, ads, and so on rely 

on the Hypertext Transfer Protocol (HTTP) to make it all possible (Figure 3.8). It’s used 

to manage communications between web browsers and web servers and opens the right 

resource when you click a link, wherever that resource may actually reside.

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Chapter 3 

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  Introduction to TCP/IP 

f I g u r e   3 . 8    HTTP

Okay! Here is the web page for

www.lammle.com

I want to get some awesome

Cisco training! I want URL

www.lammle.com!

http://www.lammle.com

In order for a browser to display a web page, it must find the exact server that has the 

right web page, plus the exact details that identify the information requested. This informa-

tion must be then be sent back to the browser. Nowadays, it’s highly doubtful that a web 

server would have only one page to display!

Your browser can understand what you need when you enter a Uniform Resource 

Locator (URL), which we usually refer to as a web address, such as, for example,  

http://www.lammle.com/forum

 and 

http://www.lammle.com/blog

.

So basically, each URL defines the protocol used to transfer data, the name of the server, 

and the particular web page on that server.