What should we call this new subject?
What are the goals of this subject?How does the internet work? This subject you'll learn the basics of how data goes from one computer to another. We use the OSI -- or Open Systems Interconnection -- model to describe the internet. Layer 7 is the application layer, such as your web browser communicating over HTTP. Layer 6 is presentation layer, such as secure transmission of your data over HTTP. Layer 5 is the session layer, such as Sockets. In Layer 4, we have the transport layer, which includes TCP and UDP. On Layer 3 we have the network layer, which includes routers to get data from one point to another. Then on layer 2 we have data links, which transfers data between two directly connected nodes. Finally on layer 1 is the physical layer -- the actual hardware of the internet. Knowing these layers will help you be better at web development, have a deeper understanding of how to protect yourself on the internet, and understand the challenges facing the development of web infrastructure.
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