The source port identifier of the received TCP segment tells the destination station which application layer process the packet is from.
This is further explained below.
Generally, A data section and a segment header are the two parts that make up a TCP segment. The segment header consists of ten required fields and one extension field that may be used if desired (Options, pink background in table). After the header comes the data section, which contains the payload data that is being conveyed for the application.
In conclusion, The source port identification of the TCP segment that was received provides the destination station with information about the application layer process from which the packet originated.
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