Each single network node can run multiple applications that use the
same network interface, and therefore use the same
IP address. For example,
an RTOS application can run a TFTP server, an echo server and a Nabto
client at the same time – all of which make use of the
TCP/IP stack.
Different applications running on the same network node, and therefore
at the same IP address, are identified by their port number.
The source and destination address of each TCP or UDP
packet is therefore a combination of an IP address and a
port number. The IP address identifies the node on the
network and the port number identifies the application
within the node (see sockets).
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