In hierarchical structure of Internet DNS servers may be called nerve knots which directly influence the whole existence of the Internet. What can threaten their “health”? What can put them out of action? And can one protect DNS servers? Before we answer the questions, let’s see what task DNS servers carry out. In a few words, the main mission of DNS servers is translation of domain names into IP addresses and back. This means, servers must get requests, process them and send responses. DNS servers must keep data about supported network addresses; they exchange requests with servers of higher level in case they cannot give a response on their own. That’s enough to see what dangers potentially threaten DNS servers.
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