Glossary
========

Many terms in this document are specific to the DNS.
This glossary contains short explanations of these terms.
For more information, :rfc:`7719` (DNS Terminology) can be consulted.

.. glossary::

  AXFR
    The query type used to request a full zone transfer.
    Commonly used to refer to the act of transferring a zone.

  fqdn
    A Fully Qualified Domain Name is a domain name that specifies its exact location in the DNS hierarchy.

  primary
  primary server
    A "primary" zone (or server) acts as a source of truth for a zone.
    :term:`secondary` servers will check at the primary server if their zones are still up to date.

  native
    A "native" zone does not used DNS-based data replication but for instance database replication.

  NS record
    NS records in a zone declare the name of the nameservers authoritative for that zone.

  record set
  RRSet
    A record set is the collection of DNS records with the same name, type and TTL.

  registry
    The organization that allows registration of names in the zone.
    These organization operate the :term:`TLDs <TLD>`.
    For .nl this is SIDN and for .com this Verisign

  secondary
  secondary zone
    A "secondary" zone (or server) retrieves its zone data from a :term:`primary` server.

  SOA record
  SOA
    Only one "Start Of Authority" record exists in a zone.
    It indicates that this domain is indeed a zone.

  TLD
  Top Level Doman
    A Top-Level Domain is a a zone that is one layer below the root, such as
    .nl and .com.

  Zone file
  Zonefile
    The de-facto storage format for DNS zones.
    This format is text-based and lists all records in a zone, one per line.