Is DNSSEC proprietary to Microsoft domain name servers?

The correct answer is that DNSSEC, or Domain Name System Security Extensions, is not proprietary to Microsoft domain name servers. DNSSEC is an open standard designed to protect against certain types of attacks on the DNS, such as cache poisoning and man-in-the-middle attacks, by allowing DNS responses to be verified for integrity and authenticity. It can be implemented on various DNS servers across different platforms and is not limited to or dependent on Microsoft solutions.

Since DNSSEC is based on open standards, it can be supported by other vendors’ DNS products, including open-source implementations, making it widely available for use in both public and private domains. Therefore, assertions that limit its availability to Microsoft specifically are incorrect. DNSSEC's ability to be implemented in a variety of environments demonstrates its versatility and importance in security practices across the internet.