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As we have discussed, when an IP packet arrives, if the packet is addressed to thisdevice, IP keeps the packet and passes it to the
As we have discussed, when an IP packet arrives, if the packet is addressed to thisdevice, IP keeps the packet and passes it to the transport layer so that it can bedelivered to the application. But how does the system know to which application apacket should be delivered? The answer is that when a packet is sent, it is stampedwith not only the source and destination addresses, but also source and destination portnumbers. When an application wants to communicate, it opens a port, and its traffic isaddressed using that port. Some ports are standard: eg port for HTTP service, andport for HTTPS service. You can find a large list here:
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