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FIREWALLS

12/3/09 12:15 PM Page 22-1. CHAPTER. FIREWALLS . The Need for FIREWALLS Firewall Characteristics Types of FIREWALLS Packet Filtering Firewall Stateful Inspection FIREWALLS Application-Level Gateway Circuit-Level Gateway Firewall Basing Bastion Host Host-Based FIREWALLS Personal Firewall Firewall Location and Configurations DMZ Networks Virtual Private Networks Distributed FIREWALLS Summary of Firewall Locations and topologies Recommended Reading and Web Site Key Terms, Review Questions, and Problems 22-1. 12/3/09 12:15 PM Page 22-2. 22-2 CHAPTER 22 / FIREWALLS . The function of a strong position is to make the forces holding it practically unassailable. On War, Carl Von Clausewitz On the day that you take up your command, block the frontier passes, destroy the official tallies, and stop the passage of all emissaries.

DMZ Networks Virtual Private Networks Distributed Firewalls Summary of Firewall Locations and Topologies 22.6 Recommended Reading and Web Site 22.7 Key Terms, Review Questions, and Problems 22-1 M23_STAL7044_05_SE_C22.QXD 12/3/09 12:15 PM Page 22-1

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