What method is used to detect missing devices in a security framework?

The correct method for detecting missing devices in a security framework is network scanning. Network scanning is a proactive approach that involves systematically searching a network to identify active devices and their associated attributes. This method helps in recognizing devices that should be present but are not, ensuring that the security framework has an accurate inventory of all connected devices.

Network scanning can uncover unauthorized devices or gaps in coverage where expected devices are missing, which is crucial for maintaining a secure environment. By continuously running network scans, organizations can monitor changes within their network and enhance their overall security posture.

The other methods mentioned, such as intrusion prevention systems, are more focused on monitoring and preventing attacks, while data backup is about preserving information rather than device detection. Detection methods as a general term would cover various strategies but does not specifically address the capability to pinpoint absent devices within a network.