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Managing Cisco Network Security, 2nd Edition by Syngress

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Chapter 13

Intrusion Detection

Introduction

A properly configured firewall appliance is considered a first line of network defense, and controls the flow of information to your servers. Unfortunately, if the server receives information from the network, it runs a risk of compromise from the unlikely event that the firewall fails. A more likely type of failure is that the firewall does its job passing traffic but that the server itself is vulnerable to an unusual request.

Other elements of that first line of defense would include Access Control ...

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