Apex domains cannot have CNAME records.
Question and response
Question
dig credit-suisse.net.do. NS
Answer
credit-suisse.net.do. 5 NS mercury.ubs.com.
credit-suisse.net.do. 5 NS dns1.credit-suisse.com.
credit-suisse.net.do. 5 NS dns2.credit-suisse.com.
credit-suisse.net.do. 5 NS uranus.ubs.com.
credit-suisse.net.do. 5 NS dns3.credit-suisse.com.
credit-suisse.net.do. 5 NS dns4.credit-suisse.com.
credit-suisse.net.do. 5 NS jupiter.ubs.com.
credit-suisse.net.do. 5 NS neptune.ubs.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0