Examination of Datagram Fields III

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Examination of Datagram Fields III

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The port fields are two separate 16-bit fields in the TCP header, one for source and another for destination ports. The valid range of values is between 1 and 65535; the use of port 0 is typically a “signature” of some sort. When a source host wishes to connect to a destination host, an ephemeral port is typically selected in the range of ports greater than 1023. For each new sending connection that the host attempts that is not a retry, a different ephemeral port should be selected.

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