Apex domains cannot have CNAME records.
Question and response
Question
dig mcmti.com.mx. NS
Answer
mcmti.com.mx. 4 NS serv0.mcmti.com.mx.
mcmti.com.mx. 4 NS ns2.mcmti.com.mx.
mcmti.com.mx. 4 NS ns7.mcmti.com.mx.
mcmti.com.mx. 4 NS ns1.mcmti.com.mx.
mcmti.com.mx. 4 NS ns8.mcmti.com.mx.
mcmti.com.mx. 4 NS ns3.mcmti.com.mx.
mcmti.com.mx. 4 NS serv4.mcmti.com.mx.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0