Apex domains cannot have CNAME records.
Question and response
Question
dig abb.net.do. NS
Answer
abb.net.do. 5 NS a22-65.akam.net.
abb.net.do. 5 NS a1-226.akam.net.
abb.net.do. 5 NS a4-64.akam.net.
abb.net.do. 5 NS a7-64.akam.net.
abb.net.do. 5 NS a10-66.akam.net.
abb.net.do. 5 NS a13-65.akam.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0