| http://www.w3.org/ns/prov#value | - The port number is a value for specifying an application to be utilized (or to be utilized at the reception side), for example, it is prescribed that a port 21 is used when the FTP is used. [0151] In the drawing, all the portions except the data portion 4009 are called TCP header, where various information is additionally included, but the description thereof will be omitted.
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