Alarms and Alerts

 

Alarms and Alerts

The logical view of network protection looks like Figure 7, in which both a router and a firewall provide layers of protection for the internal network. Now let us add one more layer to this defense.

Figure 33Figure 7  Layered Network Protection.

An intrusion detection system is a device that is placed inside a protected network to monitor what occurs within the network. If an attacker is able to pass through the router and pass through the firewall, an intrusion detection system offers the opportunity to detect the attack at the beginning, in progress, or after it has occurred. Intrusion detection systems activate an alarm, which can take defensive action. We study intrusion detection systems in more detail later in this chapter.

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