Apex domains cannot have CNAME records.
Question and response
Question
dig sktechno.com. NS
Answer
sktechno.com. 3 NS ns2.sktechno.com.
sktechno.com. 3 NS ns1.sktechno.com.
Authority
The response has no authority records.
Additional
ns1.sktechno.com. 3 A 74.208.195.33
ns2.sktechno.com. 3 A 209.46.125.29
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0