--> SPI stands for Security Parameter Index.
--> The Security Parameter Index (SPI) is a most important component in the Security Association of IPSEC.
--> An SPI is a 32-bit number that is used to uniquely identify a particular Security Association for any connected device.
--> A Security Association (SA) is an agreement between two devices about how to protect information during communication. It also indicates the parameters, such as keys and algorithms.
--> SPI provides a mechanism for the destination to identify which SA to use to check the security of the received packet. The SPI is provided to map the incoming packet to an SA at the destination.
--> The Security Parameter Index (SPI) is a most important component in the Security Association of IPSEC.
--> An SPI is a 32-bit number that is used to uniquely identify a particular Security Association for any connected device.
--> A Security Association (SA) is an agreement between two devices about how to protect information during communication. It also indicates the parameters, such as keys and algorithms.
--> SPI provides a mechanism for the destination to identify which SA to use to check the security of the received packet. The SPI is provided to map the incoming packet to an SA at the destination.
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