The class C of each IP must be different so that the servers are not found on the same bay and therefore there is a risk of unavailability. The Bind version should not be visible otherwise it will be possible to search for potential security vulnerabilities of the version. In order for the availability rate of DNS servers to be at its highest, it is vital and recommended by the RFC to have at least 2 servers. The most important information is the master server and the contact email address. DNS resolvers that allow queries from all IP addresses and are exposed to the Internet can be attacked and used to conduct Denial of Service DoS attacks on behalf of the hacker.
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