Source Port Number

This fields occupies  the first 16 bytes of the UDP header. This  fields typically hold the UDP port number  of the application sending  this datagram. The value  entered in the  source  port issued  by the receiving  application  as a return address when it  is ready to send a  response. This fields  is considered  considered  optional  and it is not required that the  sending  application  includes  is port number 

 

                                     figure User Datagram Protocols Format

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