SUNWCrnet explained
One of the new features in the Installation section is the appearance of a new Metacluster or Cluster Configuration called SUNWCrnet. Super minimum with many things blocked by default and only few processes running, less than 200MB all included. The smallest Metacluster, even smaller than SUNWCreq, the core Metacluster. Mr Brunette, from Sun, has written an article that shows some screens of a newly installed Solaris machine with SUNWCrnet.
Note : this is still different from running SST ( Solaris Security Toolkit, ex-JASS ) after a fresh install