Apex domains cannot have CNAME records.
Question and response
Question
dig ipisa.edu.do. NS
Answer
ipisa.edu.do. 5 NS ns13.domaincontrol.com.
ipisa.edu.do. 5 NS ns14.domaincontrol.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0