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Hierarchy of DNS Servers

DNS uses a large number of server organized in hierarchical  fashion  and distribution  around the world. No single DNS server has all  of the  mappings for all  of the  hosts in the internet. instead the mappings  are distributed  across the DNS  servers. There  are three class of DNS server root  DNS  servers top level domain  servers and authoritative DNS servers organized  in a hierarchy as show in figure.

Computer Network & Security, Computer Science

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