Apex domains cannot have CNAME records.
Question and response
Question
dig pcis.edu.do. NS
Answer
pcis.edu.do. 5 NS ns1.cloudns.net.
pcis.edu.do. 5 NS pns2.cloudns.net.
pcis.edu.do. 5 NS pns1.cloudns.net.
pcis.edu.do. 5 NS pns3.cloudns.net.
Authority
The response has no authority records.
Additional
pns1.cloudns.net. 5 A 185.136.96.111
pns1.cloudns.net. 5 AAAA 2a06:fb00:1:0:0:0:1:111
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0