My colleague told me the news reproted in Metro news related to root server attack two days ago.
This time, DDoS attackers successfully struck down "L" and "G" root servers plus one .org TLD nameservers. One of the root server hit down is operated by US Department of Defense in Pentagon. The attack lasted for 12 hours. However, there was no noticeable interruption to the Internet service.
Given there are now over 90 root server mirrors all over the world backing up the original 13 root nameservers by anycast routing, there is no chance of bringing down the entire root domain.
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