Chapter 8
Securing the Network Infrastructure
CERTIFICATION OBJECTIVES
8.01 Understanding Firewalls
8.02 Using Intrusion Detection Systems
8.03 Network Design and Administration Principles
8.04 Securing Devices
QQUESTIONS
Firewalls are an integral part of computer networks and come in various forms, such as NAT firewalls, packet-filtering firewalls, and proxy servers. Some firewalls perform deep packet inspection, whereas others examine only packet headers. Intrusion detection analyzes and identifies suspicious activity. Intrusion prevention extends this detection by attempting to block the suspicious activity. Both can be performed for a network or for a specific host. Besides firewalling, it’s also important to remember basic ...
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