Apex domains cannot have CNAME records.
Question and response
Question
dig sc.wp.shawcable.net. NS
Answer
sc.wp.shawcable.net. 5 NS ns2.sc.wp.shawcable.net.
sc.wp.shawcable.net. 5 NS ns1.nr.wp.shawcable.net.
Authority
The response has no authority records.
Additional
ns1.nr.wp.shawcable.net. 5 A 64.59.176.50
ns2.sc.wp.shawcable.net. 5 A 64.59.176.235
ns1.nr.wp.shawcable.net. 5 AAAA 2001:4e8:0:4002:0:0:53:1
ns2.sc.wp.shawcable.net. 5 AAAA 2001:4e8:0:4012:0:0:53:2
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0