'Connect to Broker without registered certificate

I setup Mosquitto to allow connexion only with user authentification ( username and password) and certificate based SSL . In case of registered certificate not working , can the client connect only with Username and Password ? here the Mosquitto conf :

    cafile /etc/mosquitto/ca_certificates/ca.crt
    keyfile /etc/mosquitto/certs/server.key
    certfile /etc/mosquitto/certs/server.crt


    password_file / etc / mosquitto / passwd
    allow_anonymous false
    listener 1883


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