A security administrator needs to implement a system that detects possible intrusions based upon a vendor provided list. Which of the following BEST describes this type of IDS?

A signature-based IDS operates by maintaining a database of known attack patterns, often called signatures, which are typically supplied by vendors. It compares incoming network traffic or system activity against these predefined signatures, alerting the administrator when a match is found, directly aligning with the use of a 'vendor provided list' for detection.

Heuristic analysis, while a detection method, typically involves using algorithms to discover new or unknown threats by analyzing deviations from normal behavior, rather than strictly relying on a static vendor-provided list of known signatures.

Anomaly-based IDS works by first establishing a baseline of normal system or network activity and then flagging any significant deviations from this baseline as potential intrusions, rather than matching against a predefined list of known threats.

Behavior-based IDS is a subset or often synonymous with anomaly-based detection, focusing on learning and monitoring user or system behavior to identify deviations from established norms, not directly using a vendor-provided list of specific attack signatures.