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Understanding Firewalls: Types and Functions in Network Security

Explore the various types of firewalls such as circuit-level and proxy server firewalls, and learn how they enforce network access control based on defined security policies to protect your network from external threats.

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Understanding Firewalls: Types and Functions in Network Security

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Presentation Transcript

  1. Chapter 7 Firewalls

  2. Firewall Definition • A network device that enforces network access control based upon a defined security policy

  3. Basic Firewall Philosophy

  4. Types of Firewalls • Circuit-level firewall • verifies TCP 3-way handshake on behalf of inside hosts • Proxy server firewalls • application aware • Proxies TCP connections on behalf of clients • not transparent to end-users • Non-stateful packet filters • Stateful packet filters • Maintains source/destination TCP/UDP port numbers, TCP sequence numbers, TCP flags, TCP session state, and UDP traffic timing based on timers • Application aware • Personal firewalls

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