it seems to be your using Solaris 11 Express
in that, netadm and netcfg was not there
instead you can use
nwamadm Command to Administer Profiles
nwamcfg Command to Configure Profiles
please verify with
if its solaris 11 express release,refer this for more info
I hope it will help...
You can also use the pkg command to search for the location of files, either installed or available in a repository:
$ pkg search -l netadm
This will tell you where the file is installed locally. If it returns no results, then you can try "pkg search -r netadm", which will tell you if it is in a repository used by your publisher.