•DNS
Domain Name System is a hierarchical
distributed naming system for computers services, or any resource
connected to the internet or private network. Mostly, It associates information
from domain names with the IP addresses. Also Domain name systems are used for
obtaining email servers in a specific domain.
Domain Name Space:
•A domain name space
consists of a tree of domain names. Each node in the tree has zero or more resoruce records associated with this domain name. The tree
sub-divides into zones beginning at the root zone.
•DNS root zone is the
top-level DNS zone in the hierachical namespace of the DNS of the itnernet. The root zone is
managed by the IANA and ICANN.
•NS records are the
DNS servers ( or name servers) records
for a zone.
•Root zone is “.” is
the root of the DNS tree on the internet. It is the zone that contains the
zones: com, net,gov, org, in, nl….
•The root name servers
are the DNS servers that are authoritative for the root zone.
DNS Records:
•DNS
servers are used to resolve name to IP addresses. We have different types of
records that can be resolved:
–A
record is the record for a host name and it can be used to resolve the IP
address from the name
–NS
record is a record for a domain name and it can be used to get the list of DNS
servers that are authoritiative for this domain.
–MX
is a record for the email servers of a specific domain name, it maps your
domain name to one or more of FQDN of email servers. These records will have different metrics.
The one with the lowest metric is the best
Follow us in our next Blog for more about DNS.
I hope this was helpful, and I would like to thank you for reading
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