Apex domains cannot have CNAME records.
Question and response
Question
dig lasvegas-nv-datacenter.com. NS
Answer
lasvegas-nv-datacenter.com. 4 NS dns1.asdf456.com.
lasvegas-nv-datacenter.com. 4 NS dns3.asdf456.com.
lasvegas-nv-datacenter.com. 4 NS dns2.asdf456.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0