Apex domains cannot have CNAME records.
Question and response
Question
dig virtualchattanooga.net. NS
Answer
virtualchattanooga.net. 5 NS ns-502.awsdns-62.com.
virtualchattanooga.net. 5 NS ns-2026.awsdns-61.co.uk.
virtualchattanooga.net. 5 NS ns-1625.awsdns-11.co.uk.
virtualchattanooga.net. 5 NS ns-1052.awsdns-03.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0