Which feature allows ForeScout to provide real-time visibility into network traffic?

The correct answer focuses on the concept of passive network monitoring and device profiling as the means by which ForeScout delivers real-time visibility into network traffic. This approach involves continuously observing network activity without actively probing devices, which means that it collects data on devices and their interactions in an unobtrusive manner.

By profiling devices as they connect to the network, ForeScout can gather detailed information about their behavior, security parameters, and compliance status. This allows for a comprehensive understanding of who is connected, what types of traffic are present, and how devices communicate with one another. Consequently, it enables administrators to identify and address potential security issues or anomalies in real-time, thus ensuring better network integrity and compliance.

In contrast to the other options, active monitoring of user devices may imply a more intrusive or direct approach that does not generally yield the same level of insight into passive traffic flows. Scheduled audits are typically retrospective and may not capture real-time changes in network behavior. Manual logging would lack the speed and efficiency of automated processes, making it less effective for timely visibility in dynamic network environments.