Which system works well for small-scale attacks but lacks processing power for large-scale attacks?

An Intrusion Prevention System (IPS) is designed to monitor network traffic for malicious activity and, unlike an Intrusion Detection System (IDS), can actively block potential threats. While IPS systems are effective in detecting and preventing smaller-scale attacks due to their ability to analyze traffic in real-time, they may struggle with larger-scale attacks that involve a significant amount of data or complex threats. This is largely due to their processing power constraints; as the volume of traffic increases, the IPS may not be able to analyze and respond to all threats effectively, leading to potential delays or failures in stopping larger-scale attacks.

This characteristic is what sets an IPS apart from other options in the context of the question. For instance, a Traffic Monitoring System primarily collects and analyzes data without active prevention capabilities. An Intrusion Detection System focuses on identifying and logging intrusions but does not prevent them, rendering it less proactive than an IPS. A Content Filtering System is designed to control the access to certain types of content, which does not necessarily relate to mitigating intrusion attempts. Thus, the unique functionalities and limitations of an IPS align precisely with the description provided in the question.