Question: In a GPRS Tunnelling Protocol User Plane (GTPv1-U) scenario, what is the significance of using UDP Destination Port number 2152 for an End Marker message, in relation to the corresponding GTP-U tunnel?
Option 1: It allows dynamic allocation of port numbers for each new tunnel.
Option 2: It ensures consistency by matching the UDP ports of the corresponding GTP-U tunnel for which the End Marker is sent.
Option 3: It enables prioritization of End Marker messages over other GTP-U traffic.
Option 4: It indicates a change in the QoS (Quality of Service) for the remaining packets in the tunnel.
Explanation: The correct answer, Option 2, highlights the importance of consistency in port usage. By using the same UDP Destination Port number (2152) and ensuring it matches the UDP Source and Destination Ports of the corresponding GTP-U tunnel, the End Marker message is correctly associated with its intended tunnel, facilitating orderly termination or management actions within that specific tunnel context in a GTPv1-U environment.