域名的概念与机制2（The concept and mechanism of domain name 2）.docVIP

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域名的概念与机制2（The concept and mechanism of domain name 2）.doc

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域名的概念与机制2（The concept and mechanism of domain name 2）

域名的概念与机制2（The concept and mechanism of domain name 2） If no special instructions, generally refers to the query. The QTYPE and QCLASS domain is 16, is a superset of defined type and class. The QTYPE domain can include: any type: and the corresponding type matching RR matches just that type. (e.g., A, PTR). AXFR: by the special area designated by QTYPE MAILB: all mailboxes and RR related *: all types of RR The QCLASS domain can include: any class: and the corresponding class matching RR *: all RR Using the query domain name, QTYPE and QCLASS, the name of the server will check the corresponding RR, the server can return a corresponding server name may include RR. For example: I hope to send an email to resolver Mockapetris@ISI.EDU, the application will require information about the ISI.EDU, will have the following query: QNAME=ISI.EDU, QTYPE=MX, QCLASS=IN, may produce a response may be: Along with the other: If you want the server to request mail exchange (exchange) information, it will immediately request the exchange server address, so to find two. Note QCLASS=* types of queries, because the server may not know the information available for all classes in the domain name system, it is not all kind of certification authority, so this type of query can not be certified. Reverse 2.7.2. query (optional) The name server can reflect the mapping relationship between the resource and the domain name. The standard query can be mapped to the SOA domain of the RR, while the reverse query mapping SOA RR to domain name. The name server for this implementation is optional, but all of the name servers must be able to understand the reverse query message, can not say that messages do not know when. The domain name system does not guarantee complete reverse query and uniqueness, because the system is in accordance with the domain name and host address or other resource type arrangement. Reverse query is mainly used for debugging, and database and support related activities. Reverse