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ISACA Certified Information Systems Auditor · Isaca
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DNS hardening
D. Perform domain name system (DNS) server security hardening. The best control to mitigate attacks that redirect Internet traffic to an unauthorized website is to perform domain name system (DNS) server security hardening (Option D). DNS server security hardening involves implementing measures to secure DNS infrastructure, preventing DNS attacks such as DNS spoofing, cache poisoning, and DNS redirection. By strengthening the security of DNS servers, organizations can help ensure the accuracy and integrity of DNS responses, reducing the risk of users being redirected to unauthorized websites.
D is the correct answer here.