Answer:
False positives on NIDS are just annoyances; false positives on NIPS cause service outages.
Step-by-step explanation:
At first glance, NIDS and NIPS look quite similar, however, there is a clear difference, one is a passive monitoring and detection system that is limited to sounding an alarm on an anomaly or a combination of signatures, and the other is a active prevention system that takes proactive action when detecting a malicious package. A NIPS is usually in line (between the firewall and the rest of the network) and takes proactive action based on the set of rules provided to it. In the case of an NIDS, the device / computer is not normally in line, but it can obtain traffic mirrored from a network or mirrored port.
These differences contribute to the different results between false positives in network-based intrusion prevention systems (NIPS) and false positives in network-based intrusion detection systems (NIDS). That's because NIPS false positives are just annoyances whereas NIPS false positives cause service interruptions.