Apex domains cannot have CNAME records.
Question and response
Question
dig summitgw.net. NS
Answer
summitgw.net. 4 NS dns1.summitgw.net.
summitgw.net. 4 NS dns2.summitgw.net.
Authority
The response has no authority records.
Additional
dns1.summitgw.net. 4 A 103.26.244.244
dns2.summitgw.net. 4 A 103.26.245.245
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0