Fundamentals of Network Communication
University of Colorado System
Computer networking and communication are shockingly complicated. It takes years or decades to become an expert. This is a great course that covers most of the important concepts for you.
The course begins with history. It is amazing to find out that telegraph was invented about 200 years ago, and from then on, there were so many exciting innovations that keep changing our life.
OSI model and 7-layered architecture is the basic. I believe any one of the layers deserves plenty of books to cover all of the related knowledge. Here in the course, you will get a basic idea of what the responsibility of each layer is. You’d better have had some experience on real physical devices like network card, routers, etc, otherwise you probably will found this OSI model is too abstract to understand.
The next challenge is Berkeley Socket API. This is a topic totally for programmers. This part of the course reminds me of many network programs that I developed and projects that I once participated in. The paradigm of using the API only draws a skeleton, actually the development of a real network program is much more complicated.
Lastly, the course is getting into something theoretical and mathematical: error detection. Single parity checks, Polynomial codes, Cyclic Redundancy Checks and Internet checksums are elaborated. The beauty of math is the part that I enjoyed the most.
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