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>OSI and TCP/IP are reference models&nbsp;</li><li>These conceptualize how communications should take place between two computer nodes. </li><li>It addresses all the processes required for effective communication and divides these processes into logical groupings called layers. </li><ul><li>When a communication system is designed in this manner, it’s known as layered architecture.</li><li>It provides an structural approach to troubleshoot an issue.</li></ul></ul> <ul><li>TCP/IP is a much simpler and practical reference model compared to the OSI model.&nbsp;</li><li>OSI model has 7 layers whereas TCP/IP models as 4 layers only.&nbsp;</li><li>The protocols that are defined in each of the layers are shown in the diagram below </li></ul>

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

Communication Reference Models: OSI vs TCP/IP