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Network Security First-Step, Second Edition by Donald Stoddard, Thomas M. Thomas

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Proxies and Application-Level Protection

Stateful packet inspection firewalls are enhanced versions of basic firewalls that just do packet filtering. The devices discussed here provide additional enhancements by analyzing the packets at the application layer. As you can see, we started with simple packet filters, added more advanced stateful packet inspection, and now we look even deeper into the packet at the application data contained within the packet.

You can use several types or technologies to provide application layer protection, and they are known by many different names. Although each technology operates slightly differently, their goal is the same: to increase the security of your network.

Application-level firewalls provide the most ...

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