Key Concepts

Review core concepts you need to learn to master this subject

OSI Model

The OSI Model is a conceptual, implementation-neutral model that describes networking in seven separate layers, where each layer covers a set of functions and tasks.

This model helps us communicate while we do network troubleshooting and architecture.

Overview of the Internet
Lesson 1 of 2
  1. 1
    It is nearly impossible to overstate how much the internet has changed how we consume information and communicate with one another. More than four billion people around the world are internet users…
  2. 2
    So how did the internet start? In 1969, the United States Department of Defense funded the creation of ARPANET, a precursor network to the internet. ARPANET stands for Advanced Research Projects …
  3. 3
    While people today often use the terms internet and world wide web interchangeably, they actually refer to quite different things. The internet refers to the actual network of connected computi…
  4. 4
    As we’ve seen, the internet is a network that links computer devices worldwide, enabling people to share information with one another despite vast distances. But how is information sent from one de…
  5. 5
    Let’s take a deeper dive into the client-server model through exploring a part of HTTP that you’ve probably seen before: HTTP status codes. When a server responds to a client, the server specifi…
  6. 6
    So far we’ve seen how a single request and response are handled between a client and a server. But most of the time, our devices aren’t making a single request. Every time we load a webpage, our de…
  7. 7
    Congratulations! You should now have a general understanding of how the internet works, including: * The growth of the internet as a network * The difference between the internet and the world wide…

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