Hello,
Earning the JNCIS-ENT/SEC will renew the JNCIA-JUNOS, if this certificate was already held. If you do not already have a JNCIA-JUNOS, one is not automatically granted to you in this case.
The JNCIA-EX is not renewed because this is a legacy certification being phased out.
You will be able to use your JNCIA-EX as a substitute for the JNCIA-JUNOS where it is a required pre-requisite.
Regards,