dns2.edu.cn has no CNAME records.
Question and response
Question
dig dns2.edu.cn. NS
Answer
The response has no answer records.
Authority
edu.cn. 9683 SOA dns.edu.cn. hostmaster.net.edu.cn. 2026030448 7200 1800 604800 21600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0