Apex domains cannot have CNAME records.
Question and response
Question
dig akamaiedge.net. NS
Answer
akamaiedge.net. 5 NS a6-192.akamaiedge.net.
akamaiedge.net. 5 NS a12-192.akamaiedge.net.
akamaiedge.net. 5 NS a28-192.akamaiedge.net.
akamaiedge.net. 5 NS ns7-194.akamaiedge.net.
akamaiedge.net. 5 NS ns3-194.akamaiedge.net.
akamaiedge.net. 5 NS la3.akamaiedge.net.
akamaiedge.net. 5 NS a1-192.akamaiedge.net.
akamaiedge.net. 5 NS a11-192.akamaiedge.net.
akamaiedge.net. 5 NS a13-192.akamaiedge.net.
akamaiedge.net. 5 NS ns5-194.akamaiedge.net.
akamaiedge.net. 5 NS lar2.akamaiedge.net.
akamaiedge.net. 5 NS la1.akamaiedge.net.
akamaiedge.net. 5 NS ns6-194.akamaiedge.net.
Authority
The response has no authority records.
Additional
la1.akamaiedge.net. 5 A 184.26.161.192
la3.akamaiedge.net. 5 A 95.101.36.192
lar2.akamaiedge.net. 5 A 2.16.40.192
a1-192.akamaiedge.net. 5 A 193.108.88.0
a6-192.akamaiedge.net. 5 A 23.211.133.192
a12-192.akamaiedge.net. 5 A 184.26.160.192
a28-192.akamaiedge.net. 5 A 95.100.173.192
ns3-194.akamaiedge.net. 5 A 23.61.199.194
ns3-194.akamaiedge.net. 5 AAAA 2600:1406:32:0:0:0:0:c2
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0