This is because an intrusion prevention system (IPS) is a security device that monitors the network traffic and detects and blocks any malicious or suspicious activity, such as attacks, exploits, or malware. An IPS can help mitigate malicious network activity by preventing it from reaching the intended target or spreading to other devices on the network. An IPS can also alert the administrator of any potential threats and provide information for further analysis and response. The source of this answer is the Cisco ENCOR v1.1 course, module 2, lesson 2.5: Implementing Firewall Technologies.