CompTIA Network+ Practice Test

What is the main responsibility of an Intrusion Prevention System (IPS)?

1. To detect suspicious activities only

2. To detect and alert on malicious activities

3. To prevent and alert on malicious traffic

4. To completely block all incoming traffic

The correct answer is: To prevent and alert on malicious traffic

An Intrusion Prevention System (IPS) is specifically designed to actively monitor network traffic for signs of malicious activity and then take action to prevent that traffic from affecting the network. Its main responsibility extends beyond simple detection; it not only identifies potential threats but also intervenes by blocking or preventing these threats from causing harm. This proactive defense mechanism is critical for maintaining network security. In contrast, while other options may mention detection or alerting, they do not encompass the full functionality of an IPS. An IPS must go a step further by not only recognizing threats but also engaging in active prevention, making it a crucial component of a comprehensive security strategy. The option that mentions completely blocking all incoming traffic is not accurate, as an IPS does not indiscriminately block traffic but rather takes targeted actions against identified threats to maintain legitimate communications.