Question: Where is the integrity check for signaling messages between a User Equipment (UE) and an evolved Node B (eNB) primarily performed to ensure continuous secure connection?
Option 1: Within the UE itself before transmission
Option 2: At the Serving Gateway (S-GW) in the core network
Option 3: Between the eNB and the Mobility Management Entity (MME)
Option 4: Within the E-UTRAN (Evolved Universal Terrestrial Radio Access Network)
Explanation: The correct answer is Option 4 because, according to the principles of E-UTRAN security, integrity checking for signaling messages is crucial to ensure that communications between a UE and an eNB remain secure and unaltered. Performing this check within the E-UTRAN itself (which encompasses the eNB) ensures that any potential tampering or alteration of signaling messages over the air interface can be promptly detected, thus maintaining the integrity of the communication session established between the UE and the eNB.