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A system that monitors important operating system files is an example of a HIDS, while a system that analyzes incoming network traffic is an example of a NIDS.
It is also possible to classify IDS by detection approach: the most well-known variants are signature-based detection (recognizing bad patterns, such as malware) and anomaly-based detection (detecting deviations from a model of "good" traffic, which often relies on machine learning).
As of March 2007, the center had no retention schedule approved by the National Archives and Records Administration and until it does, has no "disposition schedule"—its "records must be considered permanent and nothing may be deleted".
To secure its data, US-CERT's center began a DHS certification and accreditation process in May 2006 and expected to complete it by the first quarter of fiscal year 2007.
This gave birth to the OMB's TIC, Trusted Internet Connections" Initiative.
Three constraints on Einstein that the DHS is trying to address are the large number of access points to U. agencies, the low number of agencies participating, and the program's "backward-looking architecture".
Some IDS have the ability to respond to detected intrusions.
Systems with response capabilities are typically referred to as an intrusion prevention system.