To ensure Microsoft Defender for Identity can gather traffic from domain controllers, what configuration is essential?

The correct answer is that at least one domain controller in the list should be a global catalog.

In the context of Microsoft Defender for Identity, a global catalog server plays a crucial role in providing the necessary data and information about user accounts, groups, and other objects across all domains within an Active Directory forest. This capability is essential for security monitoring and incidents detection, as it enables Microsoft Defender for Identity to gather and analyze data from a broader scope of the Active Directory environment. The global catalog allows for fast and efficient queries, which is crucial for the timely detection of potential threats and anomalies.

While other options may pertain to performance or configuration standards within an Active Directory environment, they do not directly address the specific requirement for Microsoft Defender for Identity to function effectively in monitoring and gathering traffic. Thus, the configuration of having at least one global catalog ensures that Microsoft Defender for Identity adequately accesses all relevant identity information necessary for its security operations.