[Q]cache in solaris 5.6 resolver

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I realized that resolver on solaris 5.6 system caches IP-Addresses which
resolved once even though TTL of the RR in the responce is 0(zero).
But resolver on solaris 5.1 does not cache if TTL is 0 (I didn't check a
case that TTL is not 0)

I want to know the resolver on solaris 5.6 surely does caching. If so, tell
me how It caches , where cache file is located(if any), and how big
expire-time of cache entry is.

I'm waiting for your reply.
Thank you in advance.