caching questions

[Charlie Romero]

Can anyone give me any pointers on why my BIND 8.2.2 doesn't seem to 
cache my requests?

I can make a request for a domain and then go back 15 minutes later 
and make the same request and BIND has to do a lookup again.  I don't 
see where I can modify any configs that define this parameter.


bmwcentral.com                SOA   86400   ns4.jumpinc.com
                                             dnsmaster.jumpinc.com
                                             Serial  2000072903
                                             Refresh 10800 (3 hours)
                                             Retry   3600 (60 minutes)
                                             Expire  604800 (7 days)
                                             Minimum TTL 86400 (24 hours)

This is a snippet of my config. This is standard stuff as per 
O'Reilly's book so where can I change this caching value?

I'm confused on why some domains seem to cache and some don't. When I 
look up their BIND config. info. it's the same as mine???

TIA,

Charlie