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2. Differences between the UDP socket interface and the TCP socket interface
a. UDP socket interface (See figure 6.2.)
• Provides an in/out port (socket) for data communication between a transmission source port
and a transmission destination port.
• Data for the transmission source and transmission destination (IP addresses and port numbers)
is specified in the send/receive data.
• Since the transmission source and transmission destination are specified in each data item, a
UDP socket can communicate with multiple remote UDP sockets.
• The UDP socket interface provides no control functionality such as reception verification using,
e.g. ACK (acknowledge) responses, or retransmission processing to assure transmission
reliability. Therefore, reliability must be assured by higher level protocols implemented by user
programs.
Figure 6.2 UDP Sockets
Transmission destination port
UDP socket
Transmission source port
UDP socket
Transmission data
Reception verification (only if
implemented by user programs)