Intrusion Detection Systems (IDS) only need to identify unauthorized access to a network or data in order to qualify for the title. A passive IDS will record an intrusion event and generate an alert to draw an operator’s attention. The passive IDS can also store information on each detected intrusion and support analysis. An active IDS is also known as an Intrusion Prevention System (IPS) or an Intrusion Detection and Prevention System (IDPS) because as well as spotting an intrusion, it implements automated actions to block out the intruder and protect resources.