Tuesday, January 13, 2009

what is DNS query

A DNS query is a question from a DNS client to resolve a domain name into an IP address. The DNS Serves in a DNS should be configured to respond to such dns queries and resolve them.

However, DNS servers can act authoritative for some domain names, slaves for others and forward queries. DNS queries are classified into following based on the way the queries resolved by DNS servers .

1. Recursive DNS Query : The complete information to the dns query is always returned. Recursive is optional for DNS servers for resolving domain names.
2. Iterative DNS Query: The complete information for the DNS query may be available. DNS servers strictly needed to support this.
3. Inverse DNS Query: This is also know as reverse ip lookup. In this IP address is resolved in to domain name
4. Multiple DNS query: In this, The DNS Servers will forward dns query to multiple secondary DNS servers to resolve the query.

nslookup is dns query tool comes with windows xp , windows 2003, vista and windows 2008 which is used to test dns query.

Relevant Posts:
DNS Query Forwarding

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