[root@lnx01 ~]# yum install nfs-utils
[root@lnx01 ~]# firewall-cmd --zone=public --add-service=nfs --permanent
[root@lnx01 ~]# systemctl reload firewalld
[root@lnx01 ~]# cat /etc/exports
/data 190.168.1.0/24(rw,no_subtree_check,no_root_squash)

[root@lnx01 ~]# systemctl start rpcbind nfs-server
[root@lnx01 ~]# systemctl enable rpcbind nfs-server

When the NFS service starts, he do a exportfs command which validate the content of /etc/exports, and put it into /var/lib/nfs/etab

# cat /var/lib/nfs/etab
/data   190.168.1.0/24(rw,sync,wdelay,hide,nocrossmnt,secure,no_root_squash,no_all_squash,no_subtree_check,secure_locks,acl,no_pnfs,anonuid=65534,anongid=65534,sec=sys,secure,no_root_squash,no_all_squash)

[root@lnx01 ~]# yum install nfs-utils
[root@lnx02 ~]# systemctl start rpcbind
[root@lnx02 ~]# systemctl enable rpcbind
[root@lnx02 ~]# mount -t nfs -o vers=4 lnx01:/data /mnt
[root@lnx02 ~]# cat /etc/fstab
.....
lnx01:/data                /mnt                   nfs     vers=4,proto=tcp,soft   0 0

Note
For NFSv3 you need additionnal steps

https://computingforgeeks.com/configure-nfsv3-and-nfsv4-on-centos-7/

https://www.stephenrlang.com/2016/01/setup-nfsv4-on-centos/