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firewall (History (First generation (When a packet does not match the…
firewall
History
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Second generation
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achieved by retaining packets until enough information is available to make a judgment about its state
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Third generation
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able to detect if an unwanted application or service is attempting to bypass the firewall using a protocol
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Types
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Application-layer
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accomplish their function by hooking into socket calls to filter the connections between the application layer and the lower layers of the OSI model
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