ERRATA at 7:20 (Switch on annotations if possible) - The concept of a Session was explained with an example of websites remembering your user ID across multiple pages. While this explanation is valid, it is wrongly attributed to being a feature of HTTP. This is incorrect - HTTP is stateless, and sessions are features added on top of HTTP by other frameworks like PHP. Thanks to commenter "LegionsOfAnon" for the correction!

Devices that communicate on the internet have many roles and responsibilities, but where is this defined? The OSI Model is a great place to start!

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