How to find NFS version
NFS is the Liunx Local Area Network Protocol which will allow you to share files and printers among the Linux and Unix systems
You can try any of the following to find the version of NFS which is running on you system
1) Issue command /usr/sbin/rpcinfo -p (This should tell you the running NFS daemeon and the versions of the NFS daemons)
2) If you have yum installed that you can also find out the NFS version using yum --version nfs