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For general usage the breadth of BIND functionality typically offsets any performance concerns.

However if the DNS is being 'hit' thousands of times per second performance is a major factor.

There are now a number of alternate Open Source DNS servers some of which stress performance.

These servers typically do NOT provide caching services (they are said to be 'Authoritative only' servers).

The zone has been delegated (via an NS Resource Record) to this DNS.

The term master was introduced with BIND 8.x and replaced the term 'primary'.

On a second or subsequent request for the same data the Caching Server (Resolver) will respond with its locally stored data (the cache) until the time-to-live (TTL) value of the response expires, at which time the server will refresh the data from the zone master.

If the caching server (resolver) obtains its data directly from a zone master it will respond as 'authoritative', if the data is supplied from its cache the response is 'non-authoritative'.

Notes: A Master DNS defines one or more zone files for which this DNS is Authoritative ('type master').

These configurations confuse two distinct but related functions.

If a server is going to provide caching services then it must support recursive queries and recursive queries need access to the root servers which is provided via the 'type hint' statement.

Diagram 3 DNS Resolver (Recursive Server) A caching server will typically have a file which includes the following fragment: To cache or not is a crucial question in the world of DNS.

BIND is regarded as the reference implementation of the DNS specification.