Question: In a GTP-U protocol entity, what is the primary purpose of the TEID in the GTP-U header when receiving traffic from multiple remote tunnel endpoints?
Option 1: To prioritize traffic based on QoS levels across all users.
Option 2: To encrypt data for secure transmission between GTP-U tunnel endpoints.
Option 3: To multiplex traffic from a single user onto different packet protocols.
Option 4: To de-multiplex incoming traffic so it can be delivered to the correct User Plane entities, allowing for multiplexing of different users, packet protocols, and QoS levels.
Explanation: The TEID in the GTP-U header plays a crucial role in de-multiplexing incoming traffic from multiple remote tunnel endpoints. This process ensures that the received traffic is correctly routed to the intended User Plane entities within the network, facilitating efficient multiplexing of different users, various packet protocols, and diverse QoS levels.