Question: Why have the standards makers chosen to specify that requests for Delivery Status Notifications are to be sent via SMTP, and not via a header

  1. Why have the standards makers chosen to specify that requests for Delivery Status Notifications are to be sent via SMTP, and not via a header in the mail heading?
  2. What protocols can be applied when you want to transfer files between different platforms, such as UNIX systems and Windows servers?
  3. In a Stop-and-Wait ARQ system, the bandwidth of the line is 2 Mbps, and 2 bit takes 30 ms to make a round trip. What is the bandwidth-delay product? If the system data frames are 10000 bits in length, what is the utilization percentage of the link?

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