Apex domains cannot have CNAME records.
Question and response
Question
dig globalsp.com. NS
Answer
globalsp.com. 5 NS DNS03003.global-asp.net.
globalsp.com. 5 NS DNS03004.globalsp.com.
Authority
The response has no authority records.
Additional
dns03003.global-asp.net. 5 A 193.168.50.250
dns03004.globalsp.com. 5 A 93.94.162.251
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0