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Which of the following intrusion detection systems (IDS) monitors network traffic and compares it against an established baseline?
Correct Answer: C
Explanation/Reference: Explanation: The anomaly-based intrusion detection system (IDS) monitors network traffic and compares it against an established baseline. This type of IDS monitors traffic and system activity for unusual behavior based on statistics. In order to identify a malicious activity, it learns normal behavior from the baseline. The anomaly-based intrusion detection is also known as behavior-based or statistical-based intrusion detection. AnswerD is incorrect. Signature-based IDS uses a database with signatures to identify possible attacks and malicious activity. Answer B is incorrect. A network-based IDS can be a dedicated hardware appliance, or an application running on a computer, attached to the network. It monitors all traffic in a network or traffic coming through an entry-point such as an Internet connection. Answer: A is incorrect. There is no such intrusion detection system (IDS) that is file-based.