Apex domains cannot have CNAME records.
Question and response
Question
dig DataNetworks.CL. NS
Answer
DataNetworks.CL. 5 NS ns2.DataNetworks.CL.
DataNetworks.CL. 5 NS ns1.DataNetworks.CL.
Authority
The response has no authority records.
Additional
ns1.DataNetworks.CL. 5 A 131.72.236.2
ns2.DataNetworks.CL. 5 A 131.72.236.2
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0