Question: What is the requirement for the UDP Destination port of an IP packet carrying a piggybacked initial message along with a triggered response message?
Option 1: It should be different from the port number used for the triggered response message.
Option 2: It should be the same as the port number used for the triggered response message.
Option 3: It can be any available UDP port.
Option 4: It is not specified and can vary depending on the implementation.
Explanation: According to the specification, when a piggybacked initial message is carried along with a triggered response message in an IP packet, they share a common UDP header. The UDP Destination port for this IP packet should be the same as the port number used for the triggered response message. This ensures that both messages are delivered correctly and efficiently.