User Datagram Protocol (UDP) is a Transport layer connectionless protocol that does not provide the reliability services available with TCP but instead provides best effort transmission services to
application protocols. UDP gives applications a direct interface with IP and the ability to address a specific application protocol running on a host via a port number without setting up an end-toend
virtual circuit or connection. UDP, like TCP, uses IP to deliver its packets.
Figure 3.4 shows how some of these components fit together.
FIGURE 3 . 4 The components in a TCP/IP block diagram
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