Question: In LTE WLAN integration using IPSec, what is the purpose of the input parameters FC, P0, and L0 when deriving LWIP-PSK from KeNB?
Option 1: To authenticate the User Equipment (UE) with the Evolved Packet Data Gateway (ePDG)
Option 2: To securely derive a key for IPSec encryption between the eNodeB (eNB) and UE
Option 3: To initialize the LWIP Counter for Quality of Service (QoS) management
Option 4: To validate the integrity of the LTE WLAN integration protocol
Explanation: The derivation of LWIP-PSK from KeNB, utilizing input parameters FC, P0, and L0, secures the communication link. These parameters (FC, P0 - LWIP Counter value, and L0 - its length) generate a secure key, LWIP-PSK, for IPSec encryption between the eNB and UE during LTE WLAN integration, ensuring data confidentiality and integrity.