Respuesta :
A firewall feature used to ensure that packets coming onto a network are legitimate responses to requests initiated by internal hosts is called stateful packet inspection.
What is Stateful Packet Inspection?
The definition of Stateful Packet Inspection is a firewall that has the ability to analyze and manage packets based on the state of the connection. A firewall with SPI capabilities is programmed to separate legal data packets from illegal data packets. The firewall will store the previous connection states in memory and then analyze the states that occurred to determine what action to take regarding the packet it just received.
SPI has a three-way handshake namely SYN, SYN-ACK and ACK. First of all the client sends a packet with the SYN bit in the header to the firewall, The firewall sees as NEW in its connection state then replies to the client with a SYN-ACK. The client responds to the firewall with an ACK and the connection status becomes ESTABLISHED.
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