Apex domains cannot have CNAME records.
Question and response
Question
dig maa.sify.net. NS
Answer
maa.sify.net. 5 NS sdns.sify.net.
maa.sify.net. 5 NS pdns.sify.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0