Windows Server 2003 System Administration Part 1

A recursive query is a query made to a DNS server, inwhich the DNS client asks the DNS server to provide acomplete answer to the query
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Windows Server 2003 System Administration Part 1Windows Server 2003 DNS jeffl@ms11.hinet.netWhat Is a Domain Namespace? Root Domain Top-Level net com org Domain Second-Level nwtraders Domain Subdomains west south east FQDN: server1.sales.south.nwtrade sales Host: server1 rs.comOverview of the DNS Query Process Query Types The DNS server returns the best answer that it can Iterative Query provide without help from other servers The DNS server returns a complete answer to the Recursive Query query, not a pointer to another DNS server Lookup Types Forward Lookup Requires name-to-address resolution Reverse Lookup Requires address-to-name resolutionHow Recursive Queries Work A recursive query is a query made to a DNS server, in which the DNS client asks the DNS server to provide a complete answer to the query DNS server checks the forward lookup zone and cache for an answer to the query Recursive query for mail1.nwtraders.c om 172.16.64.11 Database Computer1 Local DNS ServerHow Iterative Queries WorkAn iterative query is a query made to a DNS server inwhich the DNS client requests the best answer that theDNS server can provide without seeking further help fromother DNS servers. The result of an iterative query is oftena referral to another DNS server lower in the DNS tree Iterative Query Local Ask Root Hint (.) DNS Server .com Iterati ve m .co r Query rad ry fo A .com nwtra sk ers nwt e que ders.c .11 o Iter m ativ ma ursiv .64 Auth eQ orita uery .16 il1. tive Rec Res 172 pon se Computer1 nwtraders.comHow Root Hint WorksRoot hints are DNS resource records stored on a DNSserver that list the IP addresses for the DNS rootservers Corp. or ISP InterNIC DNS Servers Root (.) Servers Root Hints Local com DNS Server microso Computer1 ftHow Forwarders WorkA forwarder is a DNS server designated by other internalDNS servers to forward queries for resolving external oroffsite DNS domain names Iterative Query Forwarder Root Hint (.) Ask Iterati .com ve Qu y ery er Qu Ask n .com 1 wtrad 4.1 ers.co ve m rsi 6.6 Iter cu ativ 2.1 Auth eQ Re orita uery 17 172 tive .16.6 Res Recu 4.11 pon rsive se mail 1.nw query trad fo nwtraders.com ...