NFSv4 on FedoraCoreX

On NFS client
/etc/fstab - used on the NFS client
/etc/auto.master - used on the NFS client
/etc/init.d/rpcgssd - required on the client when RPCSEC_GSS is used

On NFS Server
/etc/exports - used on the NFS server
/etc/sysconfig/nfs - used on the NFS server
/etc/init.d/nfs - required on the server
/etc/init.d/rpcsvcgssd - required on the server when RPCSEC_GSS is used

On both NFS Client/Server
/etc/idmapd.conf - used on the NFS client and server
/etc/gssapi_mech.conf - used on the NFS client and server
/etc/init.d/portmap - used on the client and server
/etc/init.d/rpcidmapd - required on both client and server

Others such as:
/etc/hosts, /etc/hosts.allow, /etc/hosts.deny, /etc/sysconfig/iptables (if firewall enabled, port tcp/2049) etc

To mount NFS during boot, put appropriate NFS entry at /etc/fstab
For more info : http://www.vanemery.com/Linux/NFSv4/NFSv4-no-rpcsec.html#intro