Question: In PMIPv6-based Mobility, when a PDN Gateway (PDN GW) sends an Update Notification message following the LMA procedure, what is the specific setting for the Acknowledge (A) flag?
Option 1: The Acknowledge (A) flag is set to "0", indicating no acknowledgement message is requested from the Serving GW.
Option 2: The Acknowledge (A) flag is set to "1", mandating an acknowledgement message from the Serving GW for reliability.
Option 3: The setting of the Acknowledge (A) flag depends on the notification reason, such as "VENDOR-SPECIFIC-REASON".
Option 4: The Acknowledge (A) flag's setting is not specified in the LMA procedure for Update Notification messages.
Explanation: In PMIPv6-based mobility, when a PDN GW follows the LMA procedure for sending an Update Notification message, the Acknowledge (A) flag should be set to "0", indicating no acknowledgement message is requested from the Serving GW, thus streamlining communication by reducing unnecessary feedback loops, particularly in reliable network scenarios.