DNS: Difference between revisions
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;ARCount: |
;ARCount: |
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Specifies the number of resource records in the Additional section of the message. |
Specifies the number of resource records in the Additional section of the message. |
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= Resource Records = |
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*RR is the unit of information entry in DNS zone files. |
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*RRs are the basic building blocks of host-name and IP information and are used to resolve all DNS queries. |
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*Resource records exist as many types to provide extended name-resolution services. |
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*Different types of RRs have different formats, as they contain different data. |
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*In general, however, many RRs share a common format, as the following address resource records example illustrates. |
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*Fields found in an A resource record: |
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microsoft.com. 600 IN A 150.150.150.1 |
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microsoft.com denotes the owner. |
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600 TTL in seconds. |
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IN Class field represents the protocol family commonly IN for Internet class. |
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A Type of resource the RR is representing. |
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150.150.150.1 Resource data or RDATA. This field is a variable type that provides information appropriate for the type of resource; in this case, it's a 32-bit IP address. |
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The following resource record types are commonly used in DNS: |
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Start of authority (SOA) |
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Name server (NS) |
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Pointer record (PTR) |
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Address (A) |
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IPv6 Address (AAAA) |
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Mail exchange (MX) |
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Canonical name (CNAME) |
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Windows Internet Naming Service (WINS) |
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WINS Reverse Look up (WINSR) |
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= Zone = |
= Zone = |