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helmi al kindy1,371 Points
Is there a particular reason as to why ...
We don't use the same DNS server ? And how is it that DNS server can not know a particular website, isn't it ICANN's job to make sure all websites are in the DNS ?
Patricia Snyder5,563 Points
Hi Helmi, The server we use is based 1st on our physical location. The server closest to us that may contain the information we need is accessed first. If that server doesn't have the information, the next server will be accessed. Luckily, there are thousands if not millions of DNS servers across the world, so there should always be one relatively close by.
Many servers have redundant information, but not all cary the same information as no one server could store all of the IP addresses, there are just too many of them. Also, from what I understand, servers specialize in top-level domains. That means that some servers only deal with .com, some deal with .net and some deal with .io.
For more information you can check out this website: https://technet.microsoft.com/en-us/magazine/2005.01.howitworksdns.aspx.
I hope this helps.