In this example, all three Kerberos security modes have been selected. If no security mode is specified when a mount request is made, the first mode that is listed is used on all NFS V3 clients (in this case, krb5). See the nfssec.conf(4) man page for more information.
# grep krb /etc/dfs/dfstab share -F nfs -o sec=krb5:krb5i:krb5p /export/home |