Apex domains cannot have CNAME records.
Question and response
Question
dig awsdns-11.net. NS
Answer
awsdns-11.net. 5 NS g-ns-1931.awsdns-11.net.
awsdns-11.net. 5 NS g-ns-460.awsdns-11.net.
awsdns-11.net. 5 NS g-ns-781.awsdns-11.net.
awsdns-11.net. 5 NS g-ns-1355.awsdns-11.net.
Authority
The response has no authority records.
Additional
g-ns-460.awsdns-11.net. 5 A 205.251.193.204
g-ns-781.awsdns-11.net. 5 A 205.251.195.13
g-ns-1355.awsdns-11.net. 5 A 205.251.197.75
g-ns-1931.awsdns-11.net. 5 A 205.251.199.139
g-ns-460.awsdns-11.net. 5 AAAA 2600:9000:5301:cc00:0:0:0:1
g-ns-781.awsdns-11.net. 5 AAAA 2600:9000:5303:d00:0:0:0:1
g-ns-1355.awsdns-11.net. 5 AAAA 2600:9000:5305:4b00:0:0:0:1
g-ns-1931.awsdns-11.net. 5 AAAA 2600:9000:5307:8b00:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0