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3.3.8. MR RDATA format (EXPERIMENTAL) 17 <BR> 3.3.9. MX RDATA format 17 <BR> 3.3.10. NULL RDATA format (EXPERIMENTAL) 17 <BR> 3.3.11. NS RDATA format 18 <BR> 3.3.12. PTR RDATA format 18 <BR> 3.3.13. SOA RDATA format 19 <BR> 3.3.14. TXT RDATA format 20 <BR> 3.4. ARPA Internet specific RRs 20 <BR> 3.4.1. A RDATA format 20 <BR> 3.4.2. WKS RDATA format 21 <BR> 3.5. IN-ADDR.ARPA domain 22 <BR> 3.6. Defining new types, classes, and special namespaces 24 <BR> 4. MESSAGES 25 <BR> 4.1. Format 25 <BR> 4.1.1. Header section format 26 <BR> 4.1.2. Question section format 28 <BR> 4.1.3. Resource record format 29 <BR> 4.1.4. Message compression 30 <BR> 4.2. Transport 32 <BR> 4.2.1. UDP usage 32 <BR> 4.2.2. TCP usage 32 <BR> 5. MASTER FILES 33 <BR> 5.1. Format 33 <BR> 5.2. Use of master files to define zones 35 <BR> 5.3. Master file example 36 <BR> 6. NAME SERVER IMPLEMENTATION 37 <BR> 6.1. Architecture 37 <BR> 6.1.1. Control 37 <BR> 6.1.2. Database 37 <BR> 6.1.3. Time 39 <BR> 6.2. Standard query processing 39 <BR> 6.3. Zone refresh and reload processing 39 <BR> 6.4. Inverse queries (Optional) 40 <BR> 6.4.1. The contents of inverse queries and responses 40 <BR> 6.4.2. Inverse query and response example 41 <BR> 6.4.3. Inverse query processing 42 <BR> <BR> <BR> <BR> <BR> <BR> <BR>Mockapetris [Page 2] <BR> <BR>RFC 1035 Domain Implementation and Specification November 1987 <BR> <BR> <BR> 6.5. Completion queries and responses 42 <BR> 7. RESOLVER IMPLEMENTATION 43 <BR> 7.1. Transforming a user request into a query 43 <BR> 7.2. Sending the queries 44 <BR> 7.3. Processing responses 46 <BR> 7.4. Using the cache 47 <BR> 8. MAIL SUPPORT 47 <BR> 8.1. Mail exchange binding 48 <BR> 8.2. Mailbox binding (Experimental) 48 <BR> 9. REFERENCES and BIBLIOGRAPHY 50 <BR> Index 54 <BR> <BR>2. INTRODUCTION <BR> <BR>2.1. Overview <BR> <BR>The goal of domain names is to provide a mechanism for naming resources <BR>in such a way that the names are usable in different hosts, networks, <BR>protocol families, internets, and administrative organizations. <BR> <BR>From the user's point of view, domain names are useful as arguments to a <BR>local agent, called a resolver, which retrieves information associated <BR>with the domain name. Thus a user might ask for the host address or <BR>mail information associated with a particular domain name. To enable <BR>the user to request a particular type of information, an appropriate <BR>query type is passed to the resolver with the domain name. To the user, <BR>the domain tree is a single information space; the resolver is <BR>responsible for hiding the distribution of data among name servers from <BR>
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