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41 lines
2.9 KiB
Plaintext
41 lines
2.9 KiB
Plaintext
2 years ago
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You have probably found yourself in this position before: you search up something on Google, click on a link, and it takes you to a web page. Everyone who uses the internet (or is it
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the World Wide Web?) has done this before; odds are, that's how you got to this very web page. Have you ever wondered what goes on in this process? How is it that, upon clicking a link,
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you are automatically transported to the right web page. How does Google fetch the results in the first place? These questions, and many more, shall be answered in this beginner's guide
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to computer networking.
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Before we begin, I would like to show the model that I will be using to teach this: a model so perfect, so beautiful in its elegance, that it puts any other model to shame. I am talking,
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of course, about the <link>OSI model</link> (what kind of model did you think I was talking about?). This will be my 'guiding document', so to speak.
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so to speak.
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The OSI model is a 7-layer model, where every upper layer is an abstraction of a lower one. The layers of the OSI model build on each other, and none of the layers can exist without
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the help of all those below it.
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will start at the very bottom, the Physical layer, and leave you at the top, the Application level.
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on't worry if some of the terms don't make sense
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to you, they didn't make sense to me either, when I first started learning networking.
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With all of that being said, let's jump straight in!
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PART 1
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Here we are, the physical layer! It's dark, dirty and grimy, and there's a distinct smell of solder55 in the air. pplication
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you open, every video game you play, every video you watch, every image you see, every web page you view, starts with a bunch of 1's and 0's. This is similar to how networks work as well:
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no matter what type of information you are sending across a network, it has to be converted into binary to be sent 'across the wire', that is, across networks. As an example: if you wanted
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to view this web page (hopefully, that's why you're here!), you have to fetch the actual document that contains the web page from me, here in Texas. Let's suppose you were living in
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New York. The document (which is stored on my computer), has to be converted into a stream of bits (1's and 0's), transported across the country to you, and then 'reassembled'
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into an actual web page. And all of that, at the drop of a hat! Isn't it amazing?
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With all of that being said, let's jump straight in!
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PART 1
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Here we are, the physical layer! It's dark, dirty and grimy, and there's a distinct smell of solder in the air. It doesn't seem like much, but this, my friends, is where it all begins.ncapsulation</b> is the opposite, the conversion of the bits, back into the original data.
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With all of that being said, let's jump straight in!
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PART 1
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Here we are, the physical layer! It's dark, dirty and grimy, and there's a distinct smell of solder in the air. It doesn't seem like much, but this, my friends, is where it all begins.
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