Apex domains cannot have CNAME records.
Question and response
Question
dig akashield.net. NS
Answer
akashield.net. 5 NS a22-64.akam.net.
akashield.net. 5 NS a1-235.akam.net.
akashield.net. 5 NS a9-66.akam.net.
akashield.net. 5 NS a12-64.akam.net.
akashield.net. 5 NS a13-67.akam.net.
akashield.net. 5 NS a20-67.akam.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0