Question: What is the primary purpose of the Non-EPS Alert Procedure initiated by the Visitor Location Register (VLR) towards the Mobility Management Entity (MME)?
Option 1: To notify the MME of a UE's location update in the EPS (Evolved Packet System) network.
Option 2: To request the MME to alert the VLR upon detection of any signaling activity from a specific User Equipment (UE).
Option 3: To inform the MME about changes in the VLR's capacity to handle UE connections.
Option 4: To synchronize the VLR and MME databases for all active UEs.
Explanation: The correct answer, Option 2, reflects the essence of the Non-EPS Alert Procedure as described. This procedure is specifically designed for the VLR to receive notifications from the MME when there is any signaling activity detected from a UE, showcasing an interaction focused on monitoring and alerting based on UE signaling. This highlights the importance of cross-entity communication in managing and tracking user equipment activity across different network components.