Apex domains cannot have CNAME records.
Question and response
Question
dig msp.gob.do. NS
Answer
msp.gob.do. 4 NS ns.msp.gob.do.
msp.gob.do. 4 NS ns1.msp.gob.do.
msp.gob.do. 4 NS ns2.msp.gob.do.
Authority
The response has no authority records.
Additional
ns.msp.gob.do. 4 A 190.122.109.210
ns1.msp.gob.do. 4 A 45.229.149.19
ns2.msp.gob.do. 4 A 190.167.194.115
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0