Key component of DNS Domain Name space FQDN


root domain "." as the top.
Below the root domain the top level or first level domain
is .com .edu .org .us. au. .in .info .net
Second level domain is registered by individual or organization.
Such us,,,, Second level domain has the many sup domains just like for it has the sub domain,,,
And there sub domain have any host.Fully qualified domain name  Domain name space Key component of DNS

For fully qualified domain it has the every level what is FQDN

FQDN Fully Qualified Domain name
first level domain .com
second level domain
sub domain administrator
final one host name of domain
This is called fully qualified domain name.

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