单项选择题
A. UDP will send an ICMP Information Request to the source host.
B. UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.
C. UDP will drop the datagrams.
D. UDP will use the sequence numbers in the datagram headers to reassemble the data in the correct order.
E. UDP will not acknowledge the datagrams and wait for a retransmission of the datagrams.
多项选择题 Although TCP segments differ from UDP segments, they both contain some common fields. What two segments do they share in common?（）
多项选择题 Which of the following protocols utilize TCP?（）
单项选择题 Which one of the following protocols uses both UDP and TCP ports for the transport layer operation?（）