Apex domains cannot have CNAME records.
Question and response
Question
dig servconfig.com. NS
Answer
servconfig.com. 5 NS ns2.servconfig.com.
servconfig.com. 5 NS ns1.servconfig.com.
Authority
The response has no authority records.
Additional
ns1.servconfig.com. 5 A 216.194.168.112
ns2.servconfig.com. 5 A 70.39.146.236
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0