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Non-recursive: A name server is defined non-recursive when it does not engage recursion to satisfy a request that it is not authoritative for.
Recursive: A name server is defined recursive when it will make an attempt to satisfy a DNS request that it does not possess the resource records for. This includes, but is not limited to querying the root name servers and then querying the authoritative name servers listed for the domain in question.
Resource Record (RR): One of the defined types of records that may be served by a DNS server. All RRs have a type code associated with them (A has type code 1, CNAME has type code 5). Named resource records include (but are not limited to) A, CNAME, MX, SOA, NS, TXT, and PTR. Additional unnamed RRs may also valid, and numbers may identify them only.
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