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Read the following article http://www.networkcomputing.com/cloud-infrastructure/how-dns-works-primer/1082634199

and give your comments about the recent DNS hack which was a DDOS attack. Should we rethink DNS? Also, read the article

 https://www.internetsociety.org/blog/tech-matters/2016/10/how-survive-dns-ddos-attack-consider-using-multiple-dns-providers