# UDP Important parts of a UDP packet: - Time to Live (TTL) - How long a packet should live on the network before being discarded. - Source port - A random (unused) port chosen by the sender. - Destination port - The port on the receiving end, which normally is determined by the application being used. - Source address - "From" IP address. - Destination address - "To" IP address. - Data - The, well, data.