Apex domains cannot have CNAME records.
Question and response
Question
dig uvsq.FR. NS
Answer
uvsq.fr. 1 NS lune.uvsq.fr.
uvsq.fr. 1 NS shiva.jussieu.fr.
uvsq.fr. 1 NS resone.univ-rennes1.fr.
uvsq.fr. 1 NS soleil.uvsq.fr.
Authority
The response has no authority records.
Additional
lune.uvsq.fr. 1 A 193.51.33.28
soleil.uvsq.fr. 1 A 193.51.24.1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0