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This section explores in details IDS, Intrusion Detection Systems which is a passive device on the network, and contrast that against an IPS, Intrusion Prevention System, what is it, and how it different from an IDS. We'll look at senor placement and how critical multiple location as well as placement is key, and how that impacts firewall. You'll learn the difference between a sniffer and an IDS and the ways in which IDS provide the analysis they are generated. We'll discuss IDS issues and response options, what Port Span is and how that impacts your analysis. Other IDS issues include false alarms, encrypted data, and packet overload over a large network, and we'll reinforce why IDS systems should be part of a layered defense security system.