Apex domains cannot have CNAME records.
Question and response
Question
dig elron.net. NS
Answer
elron.net. 5 NS dns.netvision.net.il.
elron.net. 5 NS nypop.elron.net.
Authority
The response has no authority records.
Additional
dns.netvision.net.il. 5 A 194.90.1.5
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0