Apex domains cannot have CNAME records.
Question and response
Question
dig tbe.taleo.net. NS
Answer
tbe.taleo.net. 5 NS a6-66.akam.net.
tbe.taleo.net. 5 NS a22-64.akam.net.
tbe.taleo.net. 5 NS a2-67.akam.net.
tbe.taleo.net. 5 NS a1-40.akam.net.
tbe.taleo.net. 5 NS a3-67.akam.net.
tbe.taleo.net. 5 NS a11-65.akam.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0