Apex domains cannot have CNAME records.
Question and response
Question
dig ezyield.com. NS
Answer
ezyield.com. 5 NS a1-186.akam.net.
ezyield.com. 5 NS a18-65.akam.net.
ezyield.com. 5 NS a13-64.akam.net.
ezyield.com. 5 NS a9-67.akam.net.
ezyield.com. 5 NS a2-66.akam.net.
ezyield.com. 5 NS a12-67.akam.net.
Authority
The response has no authority records.
Additional
a2-66.akam.net. 5 A 95.100.174.66
a9-67.akam.net. 5 A 184.85.248.67
a1-186.akam.net. 5 A 193.108.91.186
a12-67.akam.net. 5 A 184.26.160.67
a13-64.akam.net. 5 A 2.22.230.64
a18-65.akam.net. 5 A 95.101.36.65
a2-66.akam.net. 5 AAAA 2600:1480:7000:0:0:0:0:42
a9-67.akam.net. 5 AAAA 2a02:26f0:117:0:0:0:0:43
a1-186.akam.net. 5 AAAA 2600:1401:2:0:0:0:0:ba
a12-67.akam.net. 5 AAAA 2600:1480:f000:0:0:0:0:43
a13-64.akam.net. 5 AAAA 2600:1480:800:0:0:0:0:40
a18-65.akam.net. 5 AAAA 2600:1480:4800:0:0:0:0:41
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0