Apex domains cannot have CNAME records.
Question and response
Question
dig linuxmagic.com. NS
Answer
linuxmagic.com. 5 NS ns2.linuxmagic.com.
linuxmagic.com. 5 NS ns3.linuxmagic.com.
linuxmagic.com. 5 NS ns4.linuxmagic.com.
linuxmagic.com. 5 NS ns.linuxmagic.com.
Authority
The response has no authority records.
Additional
ns.linuxmagic.com. 5 A 104.128.145.1
ns2.linuxmagic.com. 5 A 104.128.145.65
ns3.linuxmagic.com. 5 A 65.39.244.13
ns4.linuxmagic.com. 5 A 172.105.4.161
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0