The correct answer for this question is this one: "anomaly, network." <span>Using MRTG, Ntop, and SNMPC to collect flow data from your routers and switches to identify traffic/packet anomalies is an example of an Anomaly, Network-based IDS/IPS.</span>
Is an example of reactive, signature based IDS/IPS
Reactive, signature based IDPS technology is one of the many methodologies used to detect attacks. In a signature based IDS, a misuse detection identifies intrusions by watching for patterns of traffic and compare them against observed events or a database of signatures from known threats. Reactive IDS/IPS, on the other hand, will not only detect and alert malicious traffic but also take pre-defined proactive actions. Using MRTG, Ntop, and SNMPC in routers will monitor traffic and help network managers easily see issues like DOS attacks and security problems.