Question: What is the primary purpose of implicit overload control mechanisms between GTP-C entities when explicit overload control is not supported or enabled?
Option 1: To prioritize messages based on their type and content.
Option 2: To reduce the overload at the overloaded node by adjusting the rate of incoming request messages.
Option 3: To ensure that all incoming request messages are processed, even if it means increasing the load on the target GTP-C entity.
Option 4: To prevent the source GTP-C entity from retransmitting request messages due to network errors or overload at the target node.
Explanation: Implicit overload control mechanisms aim to reduce the overload at the overloaded node by adjusting the rate of incoming request messages. This is achieved through message throttling, prioritization, and assessing the overload level based on reject responses indicating temporary unavailability of resources.