Apex domains cannot have CNAME records.
Question and response
Question
dig fiberlink.com. NS
Answer
fiberlink.com. 5 NS a7-64.akam.net.
fiberlink.com. 5 NS a16-65.akam.net.
fiberlink.com. 5 NS a20-64.akam.net.
fiberlink.com. 5 NS a1-64.akam.net.
fiberlink.com. 5 NS a6-67.akam.net.
fiberlink.com. 5 NS a3-66.akam.net.
Authority
The response has no authority records.
Additional
a6-67.akam.net. 5 A 23.211.133.67
a6-67.akam.net. 5 AAAA 2600:1401:1:0:0:0:0:43
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0