18 Intrusion Detection and Prevention Systems
Intrusion detection systems (IDSs) and intrusion prevention systems (IPSs) are important tools in a computer security arsenal. Often thought of as a tertiary extra after antivirus software and firewalls, an IDS is often the best way to detect a security breach. As useful as they can be, however, successfully deploying an IDS or IPS is one of the biggest challenges a security administrator can face.
This chapter will introduce IDS/IPS concepts, describe the different IDS and IPS types available, identify features to help you evaluate different solutions, and discuss real-life deployment considerations. By the end of this chapter, you should have a rich understanding of both systems ...

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