Step by Step Explanation: A high volume of DNS queries to unknown domains may indicate domain generation algorithm (DGA) activity associated with malware. Checking for data exfiltration is the next logical step to determine if sensitive data is being leaked to these domains. Reconfiguring DNS settings, browsing unknown domains, or blocking the domains are reactive steps that do not address the root cause. Reference: CASP+ Exam Objectives 3.1 - Analyze indicators of compromise to determine data exfiltration risks.