Chapter: Cryptography and Network Security Principles and Practice : System Security : Firewalls

Firewalls

A firewall forms a barrier through which the traffic going in each direction must pass. A firewall security policy dictates which traffic is authorized to pass in each direction.

Chapter 22 FIREWALLS

o The Need for Firewalls

o Firewall Characteristics

o Types of Firewalls

· Packet Filtering Firewall

· Stateful Inspection Firewalls

· Application-Level Gateway

· Circuit-Level Gateway

o Firewall Basing

· Bastion Host

· Host-Based Firewalls

· Personal Firewall

o Firewall Location and Configurations

· DMZ Networks

· Virtual Private Networks

· Distributed Firewalls

· Summary of Firewall Locations and Topologies

KEY POINTS

◆ A firewall forms a barrier through which the traffic going in each direction must pass. A firewall security policy dictates which traffic is authorized to pass in each direction.

◆ A firewall may be designed to operate as a filter at the level of IP packets, or may operate at a higher protocol layer.

Firewalls can be an effective means of protecting a local system or network of systems from network-based security threats while at the same time affording access to the out- side world via wide area networks and the Internet.

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Cryptography and Network Security Principles and Practice : System Security : Firewalls : Firewalls |