draft-madi-dnsop-drzom-00.txt:There are usually three official points of contact for a top-:UNKNOWN:UNKNOWN:10:nov:2014:26::Active:: draft-madi-dnsop-drzom-00.txt:Each top-level domain is served by two or more name servers. Top-:UNKNOWN:UNKNOWN:10:nov:2014:26::Active:: draft-madi-dnsop-drzom-00.txt:Name servers are occasionally renumbered. Also:UNKNOWN:UNKNOWN:10:nov:2014:26::Active:: draft-madi-dnsop-drzom-00.txt:TLD operators request to update their DS records in root zone.:UNKNOWN:UNKNOWN:10:nov:2014:26::Active:: draft-madi-dnsop-drzom-00.txt:For each change:UNKNOWN:UNKNOWN:10:nov:2014:26::Active:: draft-madi-dnsop-drzom-00.txt:Di Ma:zdns:china:10:nov:2014:26::Active:: draft-madi-dnsop-drzom-00.txt:Feng Han:zdns:china:10:nov:2014:26::Active:: draft-madi-dnsop-drzom-00.txt:Linjian Song:UNKNOWN:china:10:nov:2014:26::Active::