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An authoritative DNS server is a server that is authoritative for a domain. It is responsible for updating the DNS records for the domain, and ensuring that the records are correct.

This is important because it ensures that clients can find the correct information when querying the DNS server.

An authoritative DNS server is important for two reasons. First, it ensures that the DNS records for a domain are correct. If the records are not correct, then clients may not be able to find the correct information when querying the DNS server.

Second, an authoritative DNS server is usually the DNS server that is used by default when a client is accessing the DNS server. This means that if the authoritative DNS server for a domain goes down, then clients may not be able to access the domain’s DNS records.

An authoritative DNS server is also important for security reasons. If the authoritative DNS server for a domain is compromised, then attackers may be able to access the domain’s DNS records.

This could allow attackers to hijack traffic and redirect users to malicious websites.