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CCNA Security Quick Reference by Anthony Sequeira

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Firewall Technologies

Firewalls are a key security technology in the modern network infrastructure. This section details their evolution and the technologies that have resulted.

Firewall fundamentals

The firewall should

Image Be resistant to attacks

Image Be the only transit point

Image Enforce the access control policy of the organization

Static packet-filtering firewalls

These work at Layer 3 and 4, examining packets one at a time. They are implemented on a Cisco ...

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