Question: In a GPRS Tunnelling Protocol User Plane (GTPv1-U) scenario, what is the requirement for the IP Source and Destination Addresses in an End Marker message relative to the corresponding GTP-U tunnel?
Option 1: The IP Source Address must differ from the tunnel's source, while the IP Destination Address remains the same as the tunnel's destination.
Option 2: Both IP addresses can be dynamically allocated for each End Marker message, independent of the tunnel's settings.
Option 3: The IP Source and Destination Addresses must match those of the corresponding GTP-U tunnel for which the End Marker message is sent.
Option 4: The IP Source Address should be a broadcast address, while the IP Destination Address mirrors the tunnel's destination address.
Explanation: This correct answer ensures continuity and consistency in communication by requiring that the End Marker message's IP addresses align with those of its associated GTP-U tunnel. This setup is crucial for proper routing and handling of the message within the network, ensuring that the termination signal (End Marker) is accurately delivered to the intended endpoint, thus maintaining the integrity of the tunnelling protocol.