Apex domains cannot have CNAME records.
Question and response
Question
dig jtglobal.com. NS
Answer
jtglobal.com. 5 NS ns2.jtibs.net.
jtglobal.com. 5 NS ns1.jtibs.net.
Authority
The response has no authority records.
Additional
ns1.jtibs.net. 5 A 212.9.0.135
ns2.jtibs.net. 5 A 212.9.0.136
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0