Apex domains cannot have CNAME records.
Question and response
Question
dig coslink.net. NS
Answer
coslink.net. 5 NS ns1.powerc.net.
coslink.net. 5 NS ns2.coslink.net.
coslink.net. 5 NS ns1.coslink.net.
Authority
The response has no authority records.
Additional
ns1.powerc.net. 5 A 64.68.224.10
ns1.coslink.net. 5 A 64.68.224.8
ns2.coslink.net. 5 A 64.68.248.10
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0