Mark Reynolds, a SOC analyst at a global financial institution, is working on the eradication phase after detecting phishing attacks targeting employees. To ensure attackers cannot reuse malicious inf

Mark Reynolds, a SOC analyst at a global financial institution, is working on the eradication phase after detecting phishing attacks targeting employees. To ensure attackers cannot reuse malicious infrastructure, Mark implements a technique that blocks known malicious IP addresses used for sending spam emails at the Domain Name System (DNS) level. Which technique is best suited?