This course is designed for novice programmers, entry level engineers and newcomers to Web Development who want to learn or revise the basic concepts related to computer networks.

The course is intended to be a refresher that can be completed in 10 hours.

Introduction to Computer Networks (ICN)

<ul><li>Short for HyperText Transfer Protocol,&nbsp;</li><li>HTTP is the underlying TCP/IP protocol used by the World Wide Web.&nbsp;HTTP is needed whenever you connect from the browser&nbsp;</li><li>The communication that takes place is&nbsp;over port 80</li><li>HTTP defines how messages are formatted and transmitted, and what actions Web servers and browsers should take in response to various HTTP commands.</li></ul><ul><li>The messages exchanged between client (web browser) and web server are of request and response nature, see animation below. </li><li>Some of the request/ response involoving HTTP are </li><ul><ul><ul><ul><li>Serving email,</li><li>Downloading requests for File Transfer Protocol (FTP) files,</li><li>Building and publishing Web pages</li></ul></ul></ul></ul><li> </li><li>The communication that takes place between client and server over the HTTP protocol is unencrypted. The encrypted version of HTTP is called HTTPS.</li></ul><blockquote style="margin: 0 0 0 40px; border: none; padding: 0px;"><blockquote style="margin: 0 0 0 40px; border: none; padding: 0px;"><ul></ul></blockquote></blockquote><blockquote style="margin: 0 0 0 40px; border: none; padding: 0px;"><blockquote style="margin: 0 0 0 40px; border: none; padding: 0px;"></blockquote></blockquote>

TCP

TCP/IP Protocols

UDP

TCP vs UDP

Networks

What happens when you type a URL in the browser to access a website ?

Internet Protocol IPv4

Internet Protocol IPv6

HTTP

What is HTTP