Apex domains cannot have CNAME records.
Question and response
Question
dig claro.net.pe. NS
Answer
claro.net.pe. 4 NS ns1.telmex.net.pe.
claro.net.pe. 4 NS ns2.telmex.net.pe.
Authority
The response has no authority records.
Additional
ns1.telmex.net.pe. 4 A 200.62.191.10
ns2.telmex.net.pe. 4 A 200.24.191.10
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0