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The three main functions of DNS in the previous video, we define DNS and briefly discussed that its
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core function is to translate domain names into IP addresses.
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This function is known as name resolution, since in most cases names are resolved to IP.
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In addition to name resolution, though, DNS happens to have two other main elements, namely namespace
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and name registration.
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Namespace is about how domain names are structured and used in terms of what makes a name valid.
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What kind of format it should have.
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What characters and symbols are allowed in it.
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As well as how names are interpreted.
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Name registration These, as the name suggests how a domain is registered, how its uniqueness is guaranteed,
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and what are the registration authorities responsible for the name assignment process.
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Every one of these areas is wide and deep, warranting a great deal of study in its own right.
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Because of that reason, each of those functions has been allocated its own section with the aim to
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study and understand fully all three functions of DNS in as much detail as possible, starting with
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namespace.
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