DNS Terminology
draft-ietf-dnsop-rfc8499bis-01
Network Working Group P. Hoffman
Internet-Draft ICANN
Obsoletes: 8499 (if approved) K. Fujiwara
Updates: 2308 (if approved) JPRS
Intended status: Best Current Practice 20 November 2020
Expires: 24 May 2021
DNS Terminology
draft-ietf-dnsop-rfc8499bis-01
Abstract
The Domain Name System (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.
This document obsoletes RFC 8499 and updates RFC 2308.
Status of This Memo
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provisions of BCP 78 and BCP 79.
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This Internet-Draft will expire on 24 May 2021.
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Hoffman & Fujiwara Expires 24 May 2021 [Page 1]
Internet-Draft DNS Terminology November 2020
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Names . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. DNS Response Codes . . . . . . . . . . . . . . . . . . . . . 9
4. DNS Transactions . . . . . . . . . . . . . . . . . . . . . . 10
5. Resource Records . . . . . . . . . . . . . . . . . . . . . . 13
6. DNS Servers and Clients . . . . . . . . . . . . . . . . . . . 15
7. Zones . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
8. Wildcards . . . . . . . . . . . . . . . . . . . . . . . . . . 27
9. Registration Model . . . . . . . . . . . . . . . . . . . . . 28
10. General DNSSEC . . . . . . . . . . . . . . . . . . . . . . . 30
11. DNSSEC States . . . . . . . . . . . . . . . . . . . . . . . . 35
12. Security Considerations . . . . . . . . . . . . . . . . . . . 37
13. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 37
14. References . . . . . . . . . . . . . . . . . . . . . . . . . 37
14.1. Normative References . . . . . . . . . . . . . . . . . . 37
14.2. Informative References . . . . . . . . . . . . . . . . . 40
Appendix A. Definitions Updated by This Document . . . . . . . . 45
Appendix B. Definitions First Defined in This Document . . . . . 45
Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . 47
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 54
1. Introduction
The Domain Name System (DNS) is a simple query-response protocol
whose messages in both directions have the same format. (Section 2
gives a definition of "global DNS", which is often what people mean
when they say "the DNS".) The protocol and message format are
defined in [RFC1034] and [RFC1035]. These RFCs defined some terms,
and later documents defined others. Some of the terms from [RFC1034]
and [RFC1035] have somewhat different meanings now than they did in
1987.
This document contains a collection of a wide variety of DNS-related
terms, organized loosely by topic. Some of them have been precisely
defined in earlier RFCs, some have been loosely defined in earlier
RFCs, and some are not defined in an earlier RFC at all.
Other organizations sometimes define DNS-related terms their own way.
For example, the WHATWG defines "domain" at
<https://url.spec.whatwg.org/>. The Root Server System Advisory
Committee (RSSAC) has a good lexicon [RSSAC026].
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