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TCP                      FTP (File Transfer Protocol)                   .2

                                                                        / IP

                       FTP 7

                                         SMTP (Simple Mail Transfer Protocol). 3

            .       URL            URL                                  URL
URL
                         Uniform Resource Locator
                                                   URL

               Hypertext Transfer Protocol (HTTP) Hypertext

                                                                     .
                                                             URL

                                 URL

                         scheme  URL

     HTTP HTTPS                                                         mailto:
                 .                                                          ftp:

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