SMC Networks SMCWBR14S-N2 - Manual (Page 109)

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Stateful Packet Inspection
This is called a “stateful” packet inspection because it examines the
contents of the packet to determine the state of the communications; i.e., it
ensures that the stated destination computer has previously requested the
current communication. This is a way of ensuring that all communications
are initiated by the recipient computer and are taking place only with