Before we go ahead and build the servers, now is a good time to make sure all the entries in the input files are correct and tidy them up if we need to. In particular, this means that we need to be careful about the password information. It's always recommended not to include root in the NIS passwd file for security reason, thus forcing each system to use the root passwd entry from their own /etc files.
There are also a number of caveats we need to be aware of when implementing NIS; the main ones we'll look at are listed here:
Password aging is not available; it is only supported in “local files,” NIS+, and LDAP.
The shadow passwd is not directly converted to a map. The passwords are pulled out and incorporated into the passwd map, ...