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What does SPI mean?

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What does SPI mean?

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Short for Stateful Packet Inspection. This refers to the mode in which a firewall operates. When a request is made to a resource on the opposite side of the firewall all replies to that request are allowed back in even if that port would normally be blocked inbound. The firewall monitors the conversation and allows it to occur. This makes it easier to setup the firewall without compromising security.

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