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Network Security Principles and Practices by Saadat Malik

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Types of Firewalls

In order to gain a thorough understanding of firewall technology, it is important to understand the various types of firewalls. These various types of firewalls provide more or less the same functions that were outlined earlier. However, their methods of doing so provide differentiation in terms of performance and level of security offered.

The firewalls discussed in this section are divided into five categories based on the mechanism that each uses to provide firewall functionality:

  • Circuit-level firewalls

  • Proxy server firewalls

  • Nonstateful packet filters

  • Stateful packet filters

  • Personal firewalls

These various types of firewalls gather different types of information from the data flowing through them to keep track of legitimate ...

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