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