DNS Terminology
RFC 7719

Document Type RFC - Informational (December 2015; Errata)
Last updated 2016-02-02
Replaces draft-hoffman-dns-terminology
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IESG IESG state RFC 7719 (Informational)
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IANA IANA review state Version Changed - Review Needed
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Internet Engineering Task Force (IETF)                        P. Hoffman
Request for Comments: 7719                                         ICANN
Category: Informational                                      A. Sullivan
ISSN: 2070-1721                                                      Dyn
                                                             K. Fujiwara
                                                                    JPRS
                                                           December 2015

                            DNS Terminology

Abstract

   The DNS is defined in literally dozens of different RFCs.  The
   terminology used by implementers and developers of DNS protocols, and
   by operators of DNS systems, has sometimes changed in the decades
   since the DNS was first defined.  This document gives current
   definitions for many of the terms used in the DNS in a single
   document.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Not all documents
   approved by the IESG are a candidate for any level of Internet
   Standard; see Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc7719.

Hoffman, et al.               Informational                     [Page 1]
RFC 7719                     DNS Terminology               December 2015

Copyright Notice

   Copyright (c) 2015 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Names . . . . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  DNS Header and Response Codes . . . . . . . . . . . . . . . .   6
   4.  Resource Records  . . . . . . . . . . . . . . . . . . . . . .   7
   5.  DNS Servers and Clients . . . . . . . . . . . . . . . . . . .   9
   6.  Zones . . . . . . . . . . . . . . . . . . . . . . . . . . . .  13
   7.  Registration Model  . . . . . . . . . . . . . . . . . . . . .  17
   8.  General DNSSEC  . . . . . . . . . . . . . . . . . . . . . . .  18
   9.  DNSSEC States . . . . . . . . . . . . . . . . . . . . . . . .  20
   10. Security Considerations . . . . . . . . . . . . . . . . . . .  22
   11. References  . . . . . . . . . . . . . . . . . . . . . . . . .  22
     11.1.  Normative References . . . . . . . . . . . . . . . . . .  22
     11.2.  Informative References . . . . . . . . . . . . . . . . .  24
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .  27
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  27

1.  Introduction

   The Domain Name System (DNS) is a simple query-response protocol
   whose messages in both directions have the same format.  The protocol
   and message format are defined in [RFC1034] and [RFC1035].  These
   RFCs defined some terms, but later documents defined others.  Some of
   the terms from RFCs 1034 and 1035 now have somewhat different
   meanings than they did in 1987.

   This document collects a wide variety of DNS-related terms.  Some of
   them have been precisely defined in earlier RFCs, some have been
   loosely defined in earlier RFCs, and some are not defined in any
   earlier RFC at all.

Hoffman, et al.               Informational                     [Page 2]
RFC 7719                     DNS Terminology               December 2015

   Most of the definitions here are the consensus definition of the DNS
   community -- both protocol developers and operators.  Some of the
   definitions differ from earlier RFCs, and those differences are
   noted.  In this document, where the consensus definition is the same
   as the one in an RFC, that RFC is quoted.  Where the consensus
   definition has changed somewhat, the RFC is mentioned but the new
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