Apex domains cannot have CNAME records.
Question and response
Question
dig MegaLink.com. NS
Answer
megalink.com. 5 NS ns2.megalink.com.
megalink.com. 5 NS ns3.megalink.com.
megalink.com. 5 NS ns4.megalink.com.
megalink.com. 5 NS ns5.megalink.com.
megalink.com. 5 NS ns6.megalink.com.
Authority
The response has no authority records.
Additional
ns2.MEGALINK.COM. 5 A 200.75.160.20
ns3.MEGALINK.COM. 5 A 23.152.224.15
ns4.MEGALINK.COM. 5 A 85.234.130.30
ns5.MEGALINK.COM. 5 A 88.99.13.51
ns6.MEGALINK.COM. 5 A 38.7.201.134
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0