DNS: Difference between revisions
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{| class="wikitable" style="margin: 0 auto; text-align:center; width:80%;" |
{| class="wikitable" style="margin: 0 auto; text-align:center; width:80%;" |
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|+DNS |
|+DNS Headers |
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| colspan="16"| Identification || colspan="1"| QR || colspan="4"| Opcode || cellpadding="1"|<tt>A<br>A</tt>|||<tt>T<br>C</tt>|||<tt>R<br>D</tt>|||<tt>R<br>A</tt>|||<tt>Z</tt>|||<tt>A<br>D</tt>|||<tt>C<br>D</tt>|| colspan="4"| RCode |
| colspan="16"| Identification || colspan="1"| QR || colspan="4"| Opcode || cellpadding="1"|<tt>A<br>A</tt>|||<tt>T<br>C</tt>|||<tt>R<br>D</tt>|||<tt>R<br>A</tt>|||<tt>Z</tt>|||<tt>A<br>D</tt>|||<tt>C<br>D</tt>|| colspan="4"| RCode |
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1 Format Error |
1 Format Error |
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2 Server Failure |
2 Server Failure |
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3 Name Error Name specified in query does not exist in domain, This code can be used by Authoritative Server for a zone (as it knows all objects & subdomains) or by caching server that |
3 Name Error Name specified in query does not exist in domain, This code can be used by Authoritative Server for a zone (as it knows all objects & subdomains) or by caching server that |
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implements negative caching. |
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4 Not Implemented Type of Query not supported by server. |
4 Not Implemented Type of Query not supported by server. |
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5 Refused Server refused to process the query, generally for policy reasons - operations such as Zone Transfer are restricted, Server will honor Zone Transfer only from certain devices. |
5 Refused Server refused to process the query, generally for policy reasons - operations such as Zone Transfer are restricted, Server will honor Zone Transfer only from certain devices. |
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;QDCount: |
;QDCount: |
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Specifies the number of questions in the Question section of the message. |
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;ANCount: |
;ANCount: |
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Specifies the number of resource records in the Answer section of the message. |
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;NSCount: |
;NSCount: |
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Specifies the number of resource records in the Authority section of the message. |
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NS stands for Name Server |
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;ARCount: |
;ARCount: |
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Specifies the number of resource records in the Additional section of the message. |
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= Zone = |
= Zone = |
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