Final answer:
The datagram length of a UDP packet is variable. UDP packets can vary in size depending on the amount of data being sent.
Step-by-step explanation:
The datagram length of a UDP packet is variable length. Unlike TCP packets, which have a fixed maximum segment size (MSS) of 1500 bytes, UDP packets can vary in size depending on the amount of data being sent. The maximum datagram size for UDP is determined by the maximum transmission unit (MTU) of the underlying network.