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 |


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