Apex domains cannot have CNAME records.
Question and response
Question
dig glinetele.com. NS
Answer
glinetele.com. 4 NS ns2.glinetele.com.
glinetele.com. 4 NS ns1.glinetele.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0