= Proactive systems monitoring is the best method to protect against emerging APT actors because it can help detect and respond to anomalous or malicious activities on the network, such as unauthorized access, data exfiltration, malware infection, or command and control communication. Proactive systems monitoring can also help identify the source, scope, and impact of an APT attack, as well as provide evidence for forensic analysis and remediation. Proactive systems monitoring can include tools such as intrusion detection and prevention systems (IDPS), security information and event management (SIEM) systems, network traffic analysis, endpoint detection and response (EDR), and threat intelligence feeds.
References = CISM Review Manual 15th Edition, page 201-2021; CISM Practice Quiz, question 922