. to cn: Authoritative AAAA records exist for ns.cernet.net, but there are no corresponding AAAA glue records.
. to cn: The glue address(es) for ns.cernet.net (202.112.0.44) differed from its authoritative address(es) (103.137.60.44, 202.112.0.44).
cn to sina.cn: The following NS name(s) were found in the authoritative NS RRset, but not in the delegation NS RRset (i.e., in the cn zone): ns1.sina.com.cn