Please Whitelist This Site?

I know everyone hates ads. But please understand that I am providing premium content for free that takes hundreds of hours of time to research and write. I don't want to go to a pay-only model like some sites, but when more and more people block ads, I end up working for free. And I have a family to support, just like you. :)

If you like The TCP/IP Guide, please consider the download version. It's priced very economically and you can read all of it in a convenient format without ads.

If you want to use this site for free, I'd be grateful if you could add the site to the whitelist for Adblock. To do so, just open the Adblock menu and select "Disable on tcpipguide.com". Or go to the Tools menu and select "Adblock Plus Preferences...". Then click "Add Filter..." at the bottom, and add this string: "@@||tcpipguide.com^$document". Then just click OK.

Thanks for your understanding!

Sincerely, Charles Kozierok
Author and Publisher, The TCP/IP Guide


NOTE: Using software to mass-download the site degrades the server and is prohibited.
If you want to read The TCP/IP Guide offline, please consider licensing it. Thank you.

The Book is Here... and Now On Sale!

Read offline with no ads or diagram watermarks!
The TCP/IP Guide

Custom Search







Table Of Contents  The TCP/IP Guide
 9  TCP/IP Application Layer Protocols, Services and Applications (OSI Layers 5, 6 and 7)
      9  Name Systems and TCP/IP Name Registration and Name Resolution
           9  TCP/IP Name Systems: Host Tables and Domain Name System (DNS)
                9  TCP/IP Domain Name System (DNS)
                     9  DNS Name Servers and Name Resolution
                          9  DNS Messaging and Message, Resource Record and Master File Formats

Previous Topic/Section
DNS Message Header and Question Section Format
Previous Page
Pages in Current Topic/Section
1
2345
Next Page
DNS Name Notation and Message Compression Technique
Next Topic/Section

DNS Message Resource Record Field Formats
(Page 1 of 5)

The exchange of information in DNS consists of a series of client/server transactions. Clients send requests, or queries, to servers, and the servers send back responses. DNS servers are of course database servers, and store DNS name database information in the form of resource records (RRs). The questions asked by clients are requests for information from a DNS's servers database, and they are answered by the DNS server looking up the requested resource records and putting them into the DNS response message.

The Answer, Authority and Additional sections of the overall DNS message format are the places where servers put DNS resource records to be sent back to a client. Each section consists of zero or more records, and in theory, any record can be placed in any section. The sections only differ in the semantics (meaning) that the client draws from a record being in one section compared to the other. The topic on DNS general messaging contains more on these three sections and how they are used.

Resource records have two representations: binary and text. The text format is used for master files edited by humans, and is the subject of a topic later in this section. The binary representation consists of regular numeric and text fields just like the other fields in the DNS message format.


Previous Topic/Section
DNS Message Header and Question Section Format
Previous Page
Pages in Current Topic/Section
1
2345
Next Page
DNS Name Notation and Message Compression Technique
Next Topic/Section

If you find The TCP/IP Guide useful, please consider making a small Paypal donation to help the site, using one of the buttons below. You can also donate a custom amount using the far right button (not less than $1 please, or PayPal gets most/all of your money!) In lieu of a larger donation, you may wish to consider purchasing a download license of The TCP/IP Guide. Thanks for your support!
Donate $2
Donate $5
Donate $10
Donate $20
Donate $30
Donate: $



Home - Table Of Contents - Contact Us

The TCP/IP Guide (http://www.TCPIPGuide.com)
Version 3.0 - Version Date: September 20, 2005

© Copyright 2001-2005 Charles M. Kozierok. All Rights Reserved.
Not responsible for any loss resulting from the use of this site.