Which of the following is a recommended practice for operating a DNS server securely?

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Multiple Choice

Which of the following is a recommended practice for operating a DNS server securely?

Using unique keys for each zone is a recommended practice for operating a DNS server securely because it enhances the integrity and confidentiality of data being transmitted within different zones of the Domain Name System (DNS). Each unique key ensures that the relationship between the zone and its corresponding records is protected from unauthorized access and tampering. This segmentation means that even if one zone's key is compromised, the security of other zones remains intact. In a well-configured DNS environment, these unique keys are used for signing zone files with DNSSEC (Domain Name System Security Extensions), which helps in preventing attacks such as cache poisoning and impersonation. This practice also ensures that any changes made to the zone data are authenticated, thus bolstering the overall security posture of the DNS server. In contrast, allowing open recursive queries can expose the DNS server to various attacks, such as amplification attacks; storing zone files in a public directory undermines confidentiality since sensitive information might be retrieved easily; and running DNS server software on outdated systems leaves vulnerabilities unpatched, making the server an easy target for exploitation.

Using unique keys for each zone is a recommended practice for operating a DNS server securely because it enhances the integrity and confidentiality of data being transmitted within different zones of the Domain Name System (DNS). Each unique key ensures that the relationship between the zone and its corresponding records is protected from unauthorized access and tampering. This segmentation means that even if one zone's key is compromised, the security of other zones remains intact.

In a well-configured DNS environment, these unique keys are used for signing zone files with DNSSEC (Domain Name System Security Extensions), which helps in preventing attacks such as cache poisoning and impersonation. This practice also ensures that any changes made to the zone data are authenticated, thus bolstering the overall security posture of the DNS server.

In contrast, allowing open recursive queries can expose the DNS server to various attacks, such as amplification attacks; storing zone files in a public directory undermines confidentiality since sensitive information might be retrieved easily; and running DNS server software on outdated systems leaves vulnerabilities unpatched, making the server an easy target for exploitation.

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