What is the difference between a Guard and a Gateway?

Guards and gateways are full application layer proxies that connect to two or more networks.  They accept data passed on an inbound network interface, ‘process it’, and then pass data to the outbound network interface.   The difference between the two is in the ‘process it’ step.
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Observations on the Forrester Report — Strategy Deep Dive: Define Your Data

The Forrester report  Strategy Deep Dive: Define Your Data (free download, registration required) has an in-depth look at the topic of data classification and defines a framework for data protection, but appears to lack in detail on the “defending the data” step.

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