Apex domains cannot have CNAME records.
Question and response
Question
dig simonbolivar.edu.do. NS
Answer
simonbolivar.edu.do. 4 NS ns1.intodomain.net.
simonbolivar.edu.do. 4 NS ns2.intodomain.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0